I won't offer my physical advice because theres enough of that around here to fill books, but I will give you some mental advice(there's probably enough of that too but oh well). If you lose don't get down, the first fights are always experience, everyone loses atleast few amateur matches. To me 0-5 shows more of a man than 2-0 or something of the sort. Good luck and enjoy the experience(i was a nervous wreck for my first few and it drained me before the fights even started).