Easy...

Just look out for "blues jams" in your area... Go... Meet a few folks... Listen to them... Find two or three that you feel comfy with and invite 'um over for an informal session... The rest will take care of itself...

As for music??? Play what you like and then look for events that work for your style, not vice versa...

When I used to get booked as a band I had a number of folks who I would call for each instrument and just mix 'um up depending who was free... The blues ain't all that tough...

B~