Basically a local jazz musician heard me play and wants me to jam out with him, but I have no playing experience with jazz. And he wants to do it publicly on top of it all.
It's great that he liked your playing enough to make the offer, so you should be proud of yourself. It's hard enough to find decent bass players to jam with amongst the amateur ranks, but even harder to find those who have jazz chops. I play blues/jazz guitar and bass and have been asked to sit in as a jazz bass player the last few years more than anything else.
I tried playing to some modal jazz songs on my iPod and I wasn't even good at that, it seemed what I played didn't fit.
There are of course many styles of jazz. Some are easier to play than others from the standpoint of bass lines. If you're going to pursue jazz, you will definitely run into a tune lists that incorporates these styles. Here's how I break it down;
1) Bossa Nova
2) Jazz/blues
3) Standards
4) Modal
I know I can't master jazz in a couple of weeks but I should be at least be able to get by.
If you learn one or two tunes in each style, it should give you a good base to start from. You'll obviously have to get the charts. Here are some suggestions;
1) Bossa Nova - Blue Bossa and/or Song For My Father are good tunes to start with. You can then advance to tunes like Girl From Ipanema and Desafinado. You see that they all have similar feel and rhythm.
2) Jazz/Blues - Learn a Bb jazz blues. Tunes like All Blues and Freddie Freeloader (both my Mile Davis) are good to learn. Learning to play a bass line over a 1-6-2-5 turnaround is the key here.
3) Standards - It's endless here, but allot of standards follow certain formats whereby you would play pretty straight forward bass lines over the head (chord changes), and some walking bass lines over the soloing. In this case, I would get a tune list from the "local jazz musician" who wants you to play with him.
4) Modal - So What by Miles Davis is a great tune to start with. It's in Dm (Key of C) and you can experiment with lines all within the C major scale. Once you've got that down, you can try Impressions which is virtually the same but at a much faster clip.
I hope this helps you. If you need any of the tunes that I mentioned (and the charts), send me a PM with your email address and I'll fire them off to you.
Have fun,
Lawrie