You might check out the web site for the Dive Pirates organization, see the link below. They take divers with disabilities on trips to locations around the world; so it is likely that any of the dive operations they use will have an efficient set-up and experienced staff and that may work for you.
I know that the Dive Pirates take an annual trip to one of my favorite locations, the Brac Reef Beach Resort on Cayman Brac. It's a small, quiet island with beautiful reefs and a clean, small, all-inclusive diver-dedicated resort with great food and a nice beach. My husband and I are getting older and we can use some assistance and the Reef Divers operation has been great for us. They handle the equipment and help us to gear up and get back on the boat. We are okay in the water, but if you need assistance in the water you should talk to them; I think that they would work with you.
The same family owns the Little Cayman Beach Resort and they use the same dive operation. The reefs off Little Cayman are even better (some of the best in the Caribbean IMO) but it's more expensive and the resort fills up quickly so you may not be able to get a reservation at the time you would like to travel.
You didn't say what else you are looking for in a dive vacation location. If you like night life, restaurants, shopping, and tourist attractions then you won't find them on the Cayman Brac or Little Cayman but these things are abundant on Grand Cayman, and they have a world-class beach on GC, too. But it is very expensive and the diving isn't as good as the smaller sister islands (again IMO) but you can get some nice dives and there are a lot of operators to choose from. I am sure that others on this board can advise you about the best dive operation options.
My husband and I like to spend 2 weeks in the Caymans, the first week on GC snorkeling and maybe doing a few dives and enjoying the island and the second week on CB or LC diving.
Check the water temp for the time of year that you will be traveling. If you go further south in the Caribbean during the winter months the water is usually very warm all year long. We usually go to the Caymans in late October or early November and the water is in the mid-80s f (or 29 C) but it would be colder (probably in the 70s F, about 25 C) during the winter. Good luck!
https://www.divepiratesfoundation.org/index.php
---------- Post added February 22nd, 2015 at 08:54 AM ----------
...By the way I need assistance with the equipment and getting in and out of the water. I need to take the bcd of in the water and someone to lift it out. Do you guys think this influences were I should go?
That's exactly the same kind of assistance that we need too, and it is automatically included in the dive services offered by Reef Divers at the Brac Reef Beach Resort and Little Cayman Beach Resort. You won't have to ask for anything special.
When you check in you will find a numbered net bag in your room for each diver. Just put your gear in the bag and set it outside your door at the requested time and they will pick it up, take it to the boat and set it up for you. You won't have to handle your gear during the rest of the week - unless you prefer to set up and manage your own gear and then they are happy to accommodate you.
We have found that it works well to let them do the heavy work and then we inspect our gear carefully on the boat. They are professionals and we've never had a problem - and we have taken 3 trips with Reef Divers.
When you are ready to dive, you carry your mask and fins to a seat at the rear of the boat and they bring your tank/bcd/regulator and help you put it on. Then you stand up and step into the water. When the dive is done, you can hand up your BCD and tank and climb up the ladder. I have also seen divers request to sit on the edge at the back or side of the boat when they help you with your gear so you can slip into the water without standing up.
When the diving day is done, put your fins, and mask in the net bag and carry it off the boat with you. They will handle your heavier gear. You dunk the net bag in the rinse tank and hang it on a hook in the gear storage room to dry; then just rinse and hang up your wet suit and carry any thing else (computer, camera, dive log) back to your room. It couldn't be easier and it is a standard part of their "valet dive service" so you don't have to ask for anything extra.
Since you are new diver, I don't know if you have your own gear yet? But Reef Divers wants to make sure that every diver has a functional computer so they provide them free of charge. We have our own (older) dive computers but we always take one of their computers as a back-up. Just a nice little extra.
Regarding Bonaire, we love Bonaire and have taken several trips there over the years - but the last time we were limited to boat dives and shore dives from the house pier - and even that was difficult because we had to carry our tanks and gear to the end of the pier and gear up by ourselves. Then climb up a long ladder back onto the pier and carry our gear back. We also had to carry our gear on and off the boats, and we had to carry our empty tanks off the boat, too. That's a lot of schlepping for senior divers.
In our younger days, Bonaire was easy and great, and we loved driving down the road with a load of tanks in the truck looking for shore dive sites; but now it's not so easy any more. Also, you are a new diver so I think that the "total diving freedom" of Bonaire might not be the best thing for any diver that hasn't had much experience yet.
I've already dived in Thailand so would like to try somewhere new. 
