Not sure where the OP is from, so apologies if this stuff isn't available.
For cutting, I use an X-Acto hobby knife and blades. I'll probably be buried with the things, I use them so much. I also have an X-Acto model saw, but I'm not sure this is the best you can buy. All of this you can find at your local big-box department store (such as Wal-Mart), or arts and crafts stores like Michael's or A. C. Moore.
For glue, I've used Zap-A-Gap before for plastic/plastic, eventually gave it up since it didn't work on metal too well for me, and I'd rather use something that works on all materials. I've used Krazy Glue in the past with great results, and lately I've been hooked on Loctite glue. All of these work. For PVA glue, I use good old-fashioned Elmer's, but pretty much any white glue will work. Heck, even the grocery stores where I live sell the stuff. Wherever you find art stuff for kids, you can find white glue (construction paper, poster paints, etc.). Often, the superglues I mentioned aren't far away from where you'll find the PVA stuff.
For brushes, the GW sets aren't half bad, actually. Good value for the money. You can get LOTS of different types of brushes at Michael's/A. C. Moore or other art supply stores. Prices and quality vary, but by and large you should avoid synthetic bristles, as they tend to "stretch" as you work with them, which makes the tip bend permanently. Maddeining, that. By far, the brush "gold standard" is the Winsor & Newton Series 7. They are not cheap, but they are invaluable, especially when it's time to do fine detail work like eyeballs. I got mine here (
Clicky!). You'll save a ton. I have one size 0, and one size 1. That, and a few other brushes for the basic, slather-it-on basecoating, a few others for drybrushing, and a couple large ones for tanks. Outside of the W&Ns, they are various brands and qualities. The synthetics, though, if I still have them, are my drybrushes, and that's about all they're good for.
Something else to consider: brush soap. You can get a cake of the stuff. Then, once you THINK your brush is clean, especially at the end of a painting session, get it wet and "paint" the cake, and watch all the paint come out! Great stuff, that. Again, check the art stores.
Kneadtite is indeed a good substitute for green stuff. In fact, I'm told it's actually the EXACT same stuff, but it's sold through GW (at a much higher price) under the "Green Stuff" brand. You can get ribbons of this stuff, enough to last the average modeler for years, for under $10 US on EBay.
Lastly, really quick, for paints, I use GW and Vallejo (mostly Vallejo) for "regular" colors, GW washes for washing, GW foundation paints for basecoating, and GW metallics.
Look for more help in the painting and modeling sub-forums here.
Good luck!
EDIT: Changed the thread title for you.
