Take or send your color or B&W film to the photo lab for processing and keep it simple so you don't get overwhelmed. Color film is much more challenging to home process, B&W is easy once you've done a few times. Trays work fine, keep it CHEAP and SIMPLE.
Negative film can be any size, 35mm or larger, color or B&W. Same with 35mm positive slides although with larger sizes people call them "chromes".
Just use the Epson 700 as-is to start and just make smaller prints until you learn more.
Yes you can make large prints from a good Epson scan but if -- after you've gained some experience -- you send your film off to be drum scanned by a good operator, you will be impressed enough by the quality difference that the Epson wont look so good.
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