I hate to say it but there are TONS of threads about this already. Search! lol...
The general theme is to bake the pumpkin and canned is better than fresh. I changed up (ever so slightly) the Samhain Pumpkin ale (use search!) another popular recipe is the the Thunder struck.
There really is no right or wrong way to do this but I can say that you will require rice hulls if putting it into the mash.