Like all herps, every burm is different, and growth will be determined by MANY factors such as genetics, quality of diet, feeding schedule, temperature/humidity levels, space, lighting, etc. You can expect a male to grow from 4-8' in its first year. One of the biggest burms I have ever seen was a male that was 17'....a real monster for a boy burm. So, don't think you are getting a small burm just because it is a male....most likely it will, but just be prepared. If you have mastered basic husbandry and know the proper protocols for managing large constrictors (ie. locked enclosures, use of tongs when feeding, use of shields, feeding snake in its own cage, etc), AND, if you have the maturity (you didn't mention age but it sounds like you are old enough) then it sounds like you are ready to go. Good luck.