Start collecting boxes are alright value. But in true GW style, newer models tend to be better in-game, but not always. Marines are good balance wise, again mostly but not always.
The new rules are out within a month i expect, along with the new boxset for the main game. So that will be a good purchase. Rules and 2 small forces. I think new style marines and Necrons.
GW paints are quite thick and dry out, but many still like them. I use Vallejo. GW washes and contrast paints are decent. Sprays i use Army Painter as cheaper and last longer. Brushes are user preference again. I try various brands.
The game is great with mates. I've made some good friends through it, but also some right idiots.