Depends on the bow length, weight and design.
A brief way to do for a simple flatbow with slight deflex/reflex design,approx 66" and around 50#:
Look for bamboo with lots of power fibes in the outer layers. If you cut bamboo, you see dark spots, most near the outer layer. The more the better.
Prepare a handle with fine fade outs, create a core layer from bamboo flooring, tapered to the tips. Glue it to the back of the handle (some deflex appreciated ;-) ) and tiller the whole, slightly whip-ended.
Prepare two bamboo stripes for belly (make them thin!! and take care that the bamboo has a uniform thickness around the nodes.) and glue them to the core and handle with lots of reflex (you are looking for ~8" of reflex ;-) ).
Then prepare a stripe of bamboo for backing, well tillered to approx. 10# or less. Make it apretty thin and glue it to the rest Add some more Reflex (plus ~2-3 ").
Now give the glue some time to cure (days, not hours), add tips and then start tillering. If you prepared the components carefully, you'll are pretty near a good tille (but not the desired draw weight).
Tiller by removing material from the sides, scraping the back between the nodes and, finally, you may take off some material from the belly if nothing other helps.
Thatzs teh way in short words. But be aware, you should have some experience with bowmaking and bamboo already - and lots of patience!
Go ahead and good luck.
