Roots work, boring, but safe.
R-5-R-5 you can play thousands of songs with the ole R-5.
try R-R-5-5, R-5-8-5.
Then throw the 3 into the picture.
If the chord is a major chord R-3-5-3.
If the chord is a minor chord R-b3-5-b3.
If the chord is a dominant seventh R-3-5-b7.
Don't get fancier than that right now.
Here is one of my favorite generic bass lines R-3-5-6-8-6-5-3. You need two measures of the same chord for this.
This may help.
http://www.talkbass.com/forum/showth...67#post9372867
Good luck. As you get a song to where you like it put it in your gig book.
Have fun.