I dont know what a 50# tank is. Oxygen tanks are sold by the cubic foot (160cuft, 265 (K tank), 300 (T tank)). I use two 160cuft tanks. One tank lasts me 4 hours on the torch. You'll have to find them on craigslist or your local oxygen supply company. For Propane, BBQ tanks are fine. $20 at Home Depot. For every propane tank you go through, you'll go through 10 or 15 oxygen tanks first. You use very little propane in comparison to oxygen.
I cant recommend what torch you want to blow big or small pieces, but if you tell me what TYPE of big or small pieces you want to make, that can help a lot. The final product you desire will dictate what equipment you need. I do caution, if your looking to make "bongs", you wont be doing it on a hand torch any time soon, that's lathe territory ($10,000 for a good lathe and UP). The GTT Lynx that I recommended will do anything from pendants to mini bubblers. Its around $400. Its a starter torch, it isnt meant to play with the big boys. However, GTT torches sell USED for the same price as NEW, so you arent losing any $$ by trying the Lynx out and learning the ropes first. Then, you can step up to a GTT Mirage if you like ($1750) which is the torch that I use. I wont ever need a bigger torch. THere's no more heat that I could possibly need.
The kiln is pretty easy to pick out. Pick it out by 110v or 220v and then make sure its the size you want to hold all the shit you'd make in a day. When you do, that's the kiln you want.
I wholeheartedly recommend Paragon kilns, they are the best durability and construction. You can choose AIM kilns instead, for about 25-30% less, with the appropriate quality loss too.
All the tools, glass, and other stuff you need you will need regardless of which torch or kiln you get. I think if your hearts into it it'll run you about $4000 to start.
Happy to help if you have any questions any time, too. Glass isnt hard, it just takes a lot of hours to learn each little technique. When you learn 10 techniques, you've made a pendant. 10 more techniques to learn and you can make a full spoon. etc etc etc....
Everything you make builds upon what you will be making next and evrything keeps coming out better every time.
What letter? I sat here five minutes trying to figure out what you mean, I'm way lost........ lol..... Sometimes my brain doesnt work.....