Since nobody actually wants to give you any advice, I'll give it a go.
First, freerolls are a mad house. they are just ridiculous. You can not and will not learn how to play poker effectively playing freerolls.
second, I feel that you have to look at freerolls as a number of tournaments within a larger tournament. Let me try to explain.
For the first hour, you should play extremely tight, and by tight i mean you are so tight that you couldn't fit a greased BB up your arse. The first hour is generally where most everyone will be going all in with any two cards(ATC). A lot of times, you will see players winning hands with this strategy, but don't buy into it. the majority of these players will be out of the tournament by the first break. So in short, you should fold anything but a premium pair(A's, K's, Q's) or AK, AQ suited. Even if that KQ suited looks just too damn pretty to let go against the idiot that went all in the last hand with 92 offsuit. If you must play a bit looser, only see cheap flops, and by cheap I mean George Jefferson cheap.
Once you've made it to hour two, the tournament actually begins. you will start to see better play almost immediately. I generally compare the second hour of freerolls to the first hour of small buy in tournaments.
you can start to loosen up a bit now, but don't go nuts. Expand your range to AJ, A10 suited, high suited connectors(KQ, QJ in late position) and medium pocket pairs(77, 88, 99, 10, JJ) By now, players have invested enough time in the tournament to actually take it a bit more seriously. Not to mention, the better players are the ones that tend to last longer and go deeper in to large Multi Table Tournaments(MTT).
By third hour, you should be close to the money. Bubble play is a completely different animal. i suggest you focus on making solid decisions on every street, learn to play your position, work on not being results oriented and getting yourself to the bubble before you work on learning how to play the bubble.
I might add that, it would be wise to stick around here. Read as much as you can and play as much as you can. you will find a completely different world of poker exists when you understand and take the time to study the game itself.
Work on getting your quality posts up here so you can join us in our freerolls. you will find that the level of play in our games is much different then the public freerolls.
I hope this helped. If you have any questions feel free to ask here or PM me if you wish. Perhaps later we can work on bubble play and In the money(ITM) play.
Also keep in mind that what I've said here may not be the best strategy, and some will most likely disagree with what I've said. This is just how i approached freerolls in general. If anybody else has anything to add, please feel free.