At the beginning of a tournament everyone should be pretty deep still so to rationally go all in you should have a strong belief you will get called. Otherwise you are doing it as a buff which is very risky or you are doing it since you have a very strong hand but likely wont get called and are losing big value. So to go all in early you would need to have a very strong hand and also the strong opinion that someone will call. If you dont think they will call, just raise and try to get some action with your strong holdings. If you think there are players who are that loose that will call big bets then you should only be going with very strong
hands which would depend on position, how loose the intended villain is etc. To simplify it, just only go all in with KK+ if you really think there is a villain who will call.