1) Personally I expect 2 or 3 levels, the registration is long as well as the blind change, the disadvantage is the small amount of chips so entering in the end is very risky, everything will depend on how you feel played at the beginning or later
2) No, I will not make a rebuy, I think it is absurd to make it in those tournaments, for example: if the last place awarded wins much less than the cost of the buyback does not make much sense to buy back, obviously your goal is not to play and win the last prize, but I always think of the worst case scenario
(only make rebuy with the option to watch the video)
3) No, I would not add-on either, basically the same thing I said in answer 2 applies, and that adds up if you have already done a rebuy, it would be a bit worse
4) My strategy is simple, do not risk myself from the beginning, always try to be very calm, in freerolls it is very difficult to have a strategy to follow, here the players are more unpredictable than in a paid tournament