Sing something that you think would fit well in that bar (I'm assuming it is 4/4 time). Then play what you sang.
+1 To avoid sounding like a rookie don't play on One to start a phrase and only play the root if a passing tone. And as Victor Wooten say don't lose the groove in order to find a note.
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Steve Barnette
The Dojo of Cool :ninja:
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Practice is the best of all instructors - Publilius Syrus