1, 15 amp is good for putting small stuff together like your doing, 30 amp or higher is good for larger projects and taking stuff apart. I use a fine tip 15amp on the PCB, and a adjustable 20 to 50 amp on the rest.
2, Drimel Tool, (or other small rotary tool) with a assortment of bits, cut off wheels, sanding drums. can food. small file's, a assortment of small screwdrivers. helping hands. can opener. magnifying glass. de-soldering tool or pump. hot glue gun.
3, check out the links in the various "Mega Sticky" in each related forum
(example) The General Modding Skills Mega-Sticky viewtopic.php?f=28&t=1195
3b, check out the various "Finished Projects" you might find a lot of tips and tricks that will help you more then any 1 straight answer otherwise.
_________________ It's more about how clever you are to make something work, rather than how well you follow instructions.
We get it, you aren't a hooker!