Hey dan, im a UK diver that started diving less than a year ago and like you, just fell in love and wanted to do nothing else. a year later i still feel exactly the same but i've learnt that its not an easy life, you have to work hard for what you get. the hours are long and like its been said before, the pay aint the best. But at the end of the day, i'd rather be diving than anything else.
After i did my AOW i felt on top of the world, but to be honest i realise that i didn't know anything really (still don't really compared to some of these old guns!) but the rescue diver is definitely the way to go. its one of the most fun courses you'll do and teaches you so much more. i found that it gave me so much more confidence under the water, and im still forever forward thinking worst case scenarios and resolutions.
After this i did a dive master internship in tenerife, which was the only way to go really. I honestly believe there is absolutely no point at all doing a 2 week DM course and just getting that cert. After all its the first step on the way to becoming a PADI pro and the most important thing it gave me was invaluable industry experience. I learnt basic maintenance on kit (even how to sew, finally at 23!!) and i got to see real life dive problems, and learnt the ins and outs of the diving day. I taught DSD'd, scuba reviews/tune ups, assisted on OW, AOW and R.D. courses, lead dives, briefings etc etc etc and learnt more than i could of hoped to.
And now at the end of it, i can effectively do what ever i want. I can continue to travel and DM around the globe - like i said for crap pay and ****e treatment - with a roof over my head and free meals, or i can do my IDC. Which il most likely be doing in the UK.
People skills are a massive plus though at the end of the day - you've just got to have that 'gift of the gab' and be able to sell courses, equip, and mostly yourself. To a lot of people breathing underwater is a scary as **** idea and you've just got to make people believe in you from the sgtart, as quite literally you have their lives in your hands.
RYA 2 advanced is a must too as most employers want some one who can handle a boat, and continue your spanish - i'm about to start learning spanish myself to help with my employability, and if you can learn the basics (at least) of outboard motor maintenance this gives you a massive advantage.
My best advice for you would be to pool your cash like a mad man though! If you've got a well paid job like you said, just build up a house sized savers account and then just travel the world, DM'ing/instructoring all over the place. At the end of the day you can literally work anywhere as long as you got flights and your kit on your back.