After a lifetime of homeschooling, my middle child started at the local high school lat year, full-time.
The experience has been far more positive than I imagined. The most difficult hurdle was placing my daughter in the correct classes. Personally, giving up the control of curriculum was the most difficult.:blushing:
Does your son have a particular interest? Joining a group at school - whether sports, plays, robotics club etc might help.
Also, holding your son back a year, as mentioned previously, might work well depending on his size/maturity.