The biggest tip I can give in online poker is to play very, very tight. Find a loose table and then wait till you hit a good hand. There will always be people who call you online and you will win big.

Bluffing is the worst thing to do online as you will get called more often. I know becuase this is where I lost a bit of money.

As far as I see it I only lose when I bluff or I get a bad beat ( 4 of a kind beats a Full House has happened to me so many times).

Of course this is just my person opinion of the sites I play at.

Personally I am still learning a lot but I have taken my account and and made over 600% return in the last few months.

I prefer SnG's but I make more money and sometimes lose alot of money at ring games. I prefer to play 6 or less seaters as I know my odds on those tables. I am not good at playing 10 seat tables as I tend to play too weak hands ( using the same hands I play with at a 6 seat table ).
Good Luck with it