Buying 1st home?

I am making a bid on my 1st home tomorrow. Should I bid asking price? Also, would it be ok to ask the seller to pay the closing costs? And can I also request things like a new stove? Or would that just sound too pushy? I am pre approved and would just like to get the best deal I can and not be taken advantage of since this is my 1st home purchase. I am bidding tomorrow with my real estate agent. ANY ADVICE is GREATLY appreciated!! Thanks : )~