Here are answers to some of your questions, the others I will leave for those most qualified to comment.

Any standard tank will do but use a Dubro brown gas stopper and 3/32" I.D. Tygon or Hayes black seamless neoprene tubing for fuel lines. Use a felt filtered in tank clunk, available from your lawn and garden store. Gas engines don't require muffler pressure .

A 4.8v 1000 mA Nicad battery is more than adequate for ignition, and remember absolutely no metal to metal contact on the throttle push rod connections. I use a standard Tx swith as a manual cut off for the ignition mounted on the fuse, but special HD switches are available. I have found the RCATS 100 electronic switch to be very good one as a Tx controlled ign.sw.

For that amount of flying a 10 oz tank will be adequate, as gas engines as very frugal in their fuel consumption.

OIL.... do I really want to go there. This topic has been kicked around on this forum umpteen of times, so my suggestion is to use the search feature here, read and then make a decision as there is more than enough info to do so. But if you don't want to go that route, use any good quality synthetic 2 stroke oil for air cooled engines and mix as per the manufacturers recommendations, staying within a 32-50:1 mix ratio range.

Karol