Samples buddy
There are many on the market
Or get a sound card and record guitar if you play
Reason is good but it's workflow is a bit of a pain. I'd recommend you use cubase and then you can sync it with reason via the rewrite function so you can still use all your reason synths etc
Check out rewire reason cubase on YouTube and google good guitar samples
How come you are at negative 4 credit without me having to investigate?