I am trying to stay away from steel tanks becuase of corrosion on the inside of water gets in.
How to phrase this without coming across a complete ahole.
You don't know what you don't know yet. In class you will learn that you NEVER let a tank get completely empty, you ALWAYS have a reserve left. The only way water gets into your tank is if it goes totally empty, in which you have much bigger problems in how to breath underwater.
In Indenia with what you've said your diving cold water which means thick wetsuit or drysuit, similar to here in NE. Steel tanks have advantages over aluminum for trim and bouyancy reasons. All the non vacation divers up here dive steel tanks.
Also aluminum will also oxidize
I expect to actually go in a lower size as I’m 220 and 511 which is in the obease spectrum I’m trying my hardest to lose weight and get down to my goal weight which is 130
At 14 you will grow if your already 5 11 expect to grow you might get slimmer but you will definitely get taller.
Again hold off on any gear purchases until you know you can and like this. Then figure out what you like best.