i'm new to space marines, just read the codex and did a little research and here's what i'm thinking for my first 500 point army:
10 man tactical squad (flamer, missile launcher, sergeant with chainsword)
5 man assault squad
5 man scouts squad (sniper rifles)
rhino or razor back
Dreadnought if points allow
please offer any and all criticism as i'm new to space marines.