I use West System 105 Resin on some of my parts, it's easy to work with and it's not to expensive
http://westsystem.com/ and I get some of my materials from U.S. Composites
http://www.shopmaninc.com/index.html
Basically there are two ways to do it, the right way IMO is to make a mold, which requires a plug to pull the mold from..... This is the only way a sane person does it if they want to make lots of parts and if at all possible the part should be vacuum bagged in the mold to reduce the chance of voids.
Moldless construction is basically the same as building something from fiberglass without a mold, but if you want the carbon weave to show up in your finished product it requires allot of sanding and some pretty serious attention to detail. Make one mistake because your in a hurry and you burn through a layer of the carbon and ruin the look.
As with anything the key with either process is patience and practice.
I hope this helps.