Depends what your after…

you will find a wealth of painting, terrain and general hobby materials here, although less on 40k tactics, strategy and rule discussion, a lot of the other 40k specific forums and sites i find to be less friendly and obsessed with minutia of tournament winning army lists which is of no interest to me (or 99% of people who would never enter a tournament anyway).

Miniwargaming is more 40k focused than OTT, and was quite welcoming to newbs last time i checked it out.

The best advice i can give though is: It doesnt matter what other people think as long as your having fun and enjoying your self, no rule is more important than to have fun, if the rule as written isnt fun, change it and have it as a house rule (just like double word score for a rude word in scrabble), if you dont enjoy painting dont wind your self up thinking i must paint them just assemble the minis and play, conversely if the game leaves you cold but you enjoy the hobby side of things concentrate on that 🙂

Welcome to the hobby!

p.s. The other rule is the rule of cool, if you think it looks cool then it is, if it isnt officially part of your army or game but looks awesome use it regardless as long as your opponents agree (which leads onto proxying, which when you want to try a unit but dont actually own one, in your situation buckets of green soldiers, lego and playmobile people make excellent reinforcments to each side in the starter box), just be carful slavishly following that rule can get expensive 😉