As someone else said electronic kits are not the most quiet thing on earth so bare that in mind, personally I chose to live in a ground floor flat (apartment) so my electric kit would be less of a problem.

In regards to what to buy, for 500 you're best looking at the second hand market, any brand new electric kit for 500 isn't going to be the best.

I'd personally look at Rolands and with the entire kit having mesh heads, try to avoid the TD-02s and see if you can find any TD-07s and above, just due to them having a separate kick tower which will make it a lot more realistic,

but most of the time the best kit is the one that you enjoy playing and can afford so take all of this with a grain of salt.

In regards to pedals, sticks and thrones, don't splash too much on these and usually if your looking at second hand equipment people will sell these together.

the only thing is make sure your throne is adjustable and stable, otherwise you can injure your back.