1) feel the need to play chaos. This can be inspired by the minis, but is not dependent on em. If it is inspired by the minis, go straight to step 4. If not, proceed to step 2.
2) read the codex and make sure it isn't really boring to play chaos
3) look at minis and decide if you like em or not. If you do, great, if not, start thinking "what can I proxy here..."
4) Start painting

