Hi Jim. This is a good site, especially if you have issues about technique or set up/repairs. I suggest you check out bluegrassbassplace.com for a great bluegrass community.
Listen to old Willie Dixon records especially "the big three trio". Also listen to some early Cab Calloway records with Milt Hinton. The Elvis Sun sessions are great recordings as well. Rockabilly is best learned by learning the sources instead just learning from "Rockabilly" players.
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Music is found in the space between the notes- in the silence between the chords. Get you spaces right, and you've got it. Albert Greenfield