Freerolls tend to be crazy, I've seen and experienced how they win and beat me with marginal cards against a premium one.
The
pokerstars freerolls by phase are extremely vague for experienced players, while in Cash games
SnG and MTT with a ticket of 5 to 20$ you will find players with a little experience.
If you want to have fun, learning freerolls are good even to start a
bankroll, but if you can start with a $1 SnG and MTT or regular tables, 0.02/0.04, that would be my best option for you.
Of course, this is my proposal, you decide which destination or game to play.
I wish you luck buddy.