For just one bow, you can spend hundreds of dollars on a fancy air-pressure form, and an electric bow oven. Not to mention hundreds more on fancy tools.
Or you can build a simple flatbow like the one pictured below for the cost of a straight length of 2x2 or 2x4, a couple 1/4" dowels and a free, used bicycle innertube.
It's a 56", 54# bendy handle flatbow. Actually in that build I didn't even use dowels and rubber bands. I used a roll of nylon stranded strapping tape spiral wrapped around the glue-up and the 2x2 form to hold things in position while the glue dried.
For tools I used a hand-held beltsander, a saber saw, a round file, and assorted sandpaper and sanding blocks.
In either case the wood and glass, going simple and inexpensive is going to cost around $18 for the two pieces of glass, about $30 for the 2-3 wood lams you'll need, and $18 for the pint kit of Smooth-On epoxy. Plus assorted sandpaper and hand tools.
The one below I built a bit cheaper, as I already had a nice length of 3/16" thick straight grain pine laying about. I bought two pieces of .040 glass and a .070 Red Elm riser, and epoxy. The straight 2x2 cot me, I think, $4 from Home Despot.
If you'd like more details, PM me.