Blind Raises, when to check and when to raise...?

[JosephTheGrt]

I am posting concerning small and big blind raises on empire/party 3/6 tables. I find myself debating raising and calling very often when i am in the blinds and there are already 4 limpers or more. Specifically i find my self unsure with hands such as AQo, 99s, 10s, AJo, A10s. Im unsure because i feel like if i raise i pump the pot too much and lose all folding equity if anyone hits the flop at all. At the same time, i feel like i am forfeiting(sp?) some of these pots to 'scary' flop aggression by late position players just raising their draws on 'scary' boards. My usual attack is to check raise the flop if it is favorable to push out as many poeple as possible, or check/fold if i feel i am 'clearly' beaten. I would like some insite to this topic so that perhaps i will have a better understanding of what i am doing and why i am doing it in these situations. thanks alot guys.
-Joey