like mad said the key to online poker is limping in and getting in cheaply with good hands and when you have AA or KK you push hard!
It takes a speical player to play some of the more garbage hands effictively, 67,78,89,910 suited are hands i play and i win more money with those hands then any other hand. I did not start playing those hands until i became really skilled at reading betting patterns and such. they can win you a lot of money, but you just really have to know how to play them and when to fold them and when not to told them.
As far as AQ, KQ, KJ, K10, Q10, J10, well these are ALL trap hands, if u make top pair, you are easily beaten but at the same time, hitting 1 pair with these hands will often win you the pot (it will be a small pot).
I think begginers should just focus on playing very tight and playing the best hands, and as they get better and better then can start to play more of the other hands. The suited connecters and small pairs are great because when u flop a big hand (as pointed out in doyle's super system) you can trap the BIG PAIRS for a BIG POT!