I suggest you start accumulating your tools slowly as your needs arise. Slow and steady, my friend.
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Don't go crazy buying stuff, go slow. some stuff is arready in your house, just look around and you may find something useful. For paints, glues etc I deal with
http://spruebrothers.com/ http://www.scalehobbyist.com/index.php and http://www.squadron.com/
I'v been modeling since the early 1970's and I buy things as I need them. The most important tools for basic building are:
Miniature file set, polishing sticks in different grits, xacto knife with tons of blades, nail clippers, Testors thin glue, thick ca. thin ca, several toothpicks for glue placement, good set of twezers, good set of paint brushes, fine grit sandpaper, small clamps (clothes pins make great small clamps) just to name a few.
Paints I purchase as the project requires. An airbrush and compressor will also go a long way in creating better quality finishes. As you advance your skills the need for more sophisticated tools come up such as the Micro Mark Punch for creating tiny discs for scratch building screw heads or cutting out instrument decals to create a more realistic instrument panel.