Check out this site, there are video clips of Daniel Peralta's instruction.
http://www.drumrhythms.com/onlinecourses.htm
Especially the clips of conga and bongo

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I own a djembe and bongos, wish I had more time to play them. Learning proper technique is imperative, you can really hurt your hands if you hit incorrectly. When buying hand drums, I don't recommend buying online. You have no way of really knowing how the drum is going to sound and respond to you. Shop around in music stores, pawn shops, etc. and when you find the right drum for the right price (or even if it's a bit more than you wanted to spend) get it and don't look back.
I've passed up opportunities for bongos that felt and sounded perfect to me, and bought slightly cheaper ones instead. Oops - please don't make this mistake.
The bongos I have are LP Aspire, paid around $67 U.S., they are well made but don't have 'the sound' or just don't respond how I'd like. When I played a pair of Toca fiberglass drums, holy wow - I was in love with them. Hope to sell my LP's for the fiberglass Tocas one day
Djembe was actually something that my wife discovered. we were in a music store and she hit a djembe and was very intrigued by the sound, we shopped around for the best sounding djembe in town and we found it. It's a hand carved shell with goatskin and string tension. Hitting near the rim gives a brilliant, crisp 'ping' and the bass tone in the center is like a mad subwoofer. Most people are amazed at the sound of this drum. We paid $350 for the djembe (ouch) but the thing sounds like magic.
Congas are probably my favorite sounding hand drum, hope to own a pair (conga / tumba set) and have lessons one day.
Bongos will be the most portable obviously, but won't give you deep sounds like a djembe or tumba (large conga).
Of the ones you played at school, do you remember what brands they were, if they had fiberglass or wood shells, and synthetic vs hide heads?