I'd suggest that you rent equipment for a while until you get a sense of what you like and what you need. This also gives you a chance to try different makes of gear.
Maybe the place you're learning from has gear that might suit you, and they will certainly pressure you to buy as much as they have. Selling new gear is the only way most shops make any money. But you can't depend on them selling gear that is appropriate for you.
Anecdotally, the best gear I have I found from reading reviews, getting feedback from others, and trying it. The least appropriate stuff I had I bought from my the shop I certified with.