It's easy to just start with a solid camo color, complete coverage, but decent quality paint from a paint store. There are economy lines that can be had in single stage with added flattener to dull the shine down (satin). Then you can purchase the same paint but in pint cans and with a simple detail gun you could go from there, whether you go military or something along the lines of stenciling, you can do pretty much whatever over the base color.
As far as masking, while you are at the paint store, buy an 18" roll of green masking paper, 3 rolls of 3/4" tape and 1 roll of 2" tape. This paper will ensure that if paint gets a little thick anywhere it won't bleed through to what you're covering. Disassemble most things like door handles, weather strip, etc... This will better cover any tape lines or the old color.
Alot of people don't realize that the paint store has reasonable prices on most basic stuff, as well as people who can tell you everything you need to know. If they don't, find another store to buy from.
I don't work for a paint store, but instead paint cars at my own shop.
I'm all for helping people learn to do it themselves.
