I'm sure you can find used recurve bows on e bay or at Amazon look over the sites. If you are just starting out, start with a bow of around 35# (lbs) but certianly no higher than 40# or 45# if you are in fair shape. Most bows come today with fast flight strings but the older bows will break or be damanaged if you use a fast Flight (FF) string with them. D-50 strings are best for the older bows.
Also if you are planning to use wooden arrows make certian that the arrows you choose are at least 10 to 15# heavier in spine weight than what you bow is rated i.e. a 40# bow should use wooden arrows in the 50-55# range.
As a rule of thumb the 125grain point FP or BH is the standard a heiver point will weaken the spine of the arrow. Conversly a lighter one will increase the spine weight of the arrow. There are various other factors which come into play. But I will not go into them here.
Hope this helps a bit.

Cyrille