Sorry,Posted too soon!

Then mark the measures you'll sing, the intro and extro, the measures where you want to have fills and licks, and if you want, the ones that will be "Instrumental"--then mix and match what you want where from your palate.

For instance--say you have a 12-bar blues--

You're basic strum is a shuffle rhythm on an E chord
Four measure intro--

First Verse:
12 measures(I-sung,3-4 lick, 5-6 sung,7-8 lick,9-10 sung, 11-12 different or turnaround)
Second Verse:
12 measures(I-sung,3-4 lick, 5-6 sung,7-8 lick,9-10 sung, 11-12 different or turnaround)

Third Verse:
12 measure instrumental-with Walking bass line instead of vocal 1-2, alternating with original lick on 3-4, etc.

Fourth Verse
2 measures(I-sung,3-4 lick, 5-6 sung,7-8 lick,9-10 sung, 11-12 different or turnaround)
And Out

I like to mark it out on a music staff--but you can even just scribble notes around the lyrics, as long as it makes sense to you when you look at it later
(again, it is really easier to make sense out of if you use a musical staff, with measures numbered, with the bonus that other musicians can look at it and play it)

Of course, it doesn't need to be blues, it can be any other sort of thing--it works the same--the principle is simple: choose from what you know, and cut and paste--