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I would suggest using AISC Provisions because the they are very detailed, readily available and you have tons of example. Make sure you download the handbook and examples available for free from AISC website and you are good to design anything. Thanks.

Good points being raised. Let me also clarify that my answer was with the assumption that only bottom cord of truss is supported on beam. If there is a horizontal reaction at pinned end then that would result in some torsion(reaction *distance to top of beam) in supporting beam. The action of wind + snow can result in uneven snow distribution of one side of the structure(if the area is considerable enough) resulting in substantial snow load. There is a good reference in book called "Why buildings fall down."