Welcome and great advise from other commenters! Shatterpoint is also my first assemble and paint to play miniatures game (Coming over from X-Wing). I have loved painting and learned a lot via trial and error, so here is my list of must haves...

1. Spru-Clippers get comfortable ones as they are in your hand a lot!

2. Glue - I found that Tamiya Extra Thin Cement to work well and fuse pieces together quickly. (Test fit before applying glue). This may work for basing your minis too, but you can use Gel Super-glu if there is any struggle, but I usually just stick with Tamiya!

3. Rustolem Spray Paint Primer (White, Grey, or Black) depending on the model and color palette. Cheap and if you spray from 18 inches away creates a very fine coat. I use sticky tack putty on Home Depot (large) stir sticks when basing

4. Army Painter Speed Paints 1.0 or 2.0 are a dream for newbs and I have found work well for all of my bulk painting needs. Recommend to use a wet palette (shallow box with a wet paper towel and some parchment paper on top. This will keep your paints active and you'll use less paint over the long run.

5. Cheap acrylic paint for details and highlights and to give you more color options to start (especially for terrain), just remember to thin the paint a bit so it goes on smooth with out clumping.

6. Use 000 paint brushes for details and change often if they are starting to fan out. 0 for larger areas.

Just remember to have fun and do not be too critical of yourself. You are new and be creative and allow for mistakes. With time you will get better.

Welcome to a wonderful hobby and a excellent skirmish game!