First, howdysecond, being a lefty is no problem,third what is your draw length now?
There are several good places to find a good learning long bow, 40/45 # is about all you would want or need seeing as how 40# is about the minimum hunting weight in most states,and anything over that could get tiring after a whyle of solid shooting.3rivers archery.com. F.S.archerydiscount archery. They have good prices on their bows and arrows . You could check there to start. Hope this helps....
David P.S. you can also look in on stickbows leatherwall for info and help too.