My advise is do your homework. Dont' rely on one source for your information. Check your sources: Do they hunt? What have they killed? Do they compete? What have they won? Do they coach? What have their students done?
How long they have been shooting can be misleading. I know one older fellow who has been shooting for 50+, maybe 60+ years. He's a decent shot, but I wouldn't recommend him as a coach.
Try different things see what works best for you.
are how do you go about picking one out?
It's very much an individual thing. Try to find a club or shop where you can get a feel for different bows. Worst case scenario, start cheap unless you just have money to burn. The Samick Sage or Journey are both very nice, good shooting, and affordable bows. You won't really know what you like until you have shot for a while.
With my compounds I shoot #70 and a 29" draw length I know #70 with no let off is probably not gona work we have to use at least #40 on deer here but I was thinking somewhere in the #50 to #60 range.
40# will do the trick just fine, as long as you do your part. A double lung with a 40# bow you can shoot accurately is much better than a gut shot with a heavier bow you can't shoot well.
What is the difference or advantage between a recurve and longbow.
Depends on the bows. In general, a recurve is faster and louder, a longbow is smoother and quieter. Never found a "cheap" longbow I would reccommend--they will usually have nasty hand shock--but some recurves can also. The grips vary from "broom handle" to "pistol grip" on both. Lots of personal preferance in selecting one or the other. Either one will work fine, as long as you do your part.
The best shooting instruction I've ever seen is "Masters of the Barebow, Volume III". Two world champions are the main players, who have coached champions, been coached by champions, and killed a lot of game between them. No bull, no smoke and mirrors, no opinions offered as fact--just good instruction by proven archers. It can take years off the learning curve.
Chad