Aye, welcome to Reenactor.net !!! And welcome to the DC, or Maryland / Virginia areas. There is a lot to check out around here, lots going on within a couple hours drive. Just depends on what direction you go in. I suggest you get familiar with guys & gals who have been doing historical military reenacting for a while, see what their different groups offer. Whatever weapon is used for a specific time period see that you learn safety with weapons - you'll have a good time.
Best of luck in your endeavors !
Cheers, Johnnie, 93rd Highlanders 1812-1858.