I get to say it first!
Lessons with a great teacher are your best investment at this point. Electric is a lot different than double bass, and there are many technical pitfalls awaiting you. Save your self a lot of re-training later by getting a good teacher now, you won't regret it!
To find a good teacher, phone the nearest musician's association (AF of M) and see who they reccommend. Call the local university or College and get the teacher's phone number. It is really best to get a classical teacher for technique, so the local symphony in your area is a good place to look. Go to a few concerts, and see if you can speak to a few of the bassists in the section afterwards. They might seem a little bit unapproachable, but let them know that you are serious, and planning to enter jazz school soon. They might be able to steer you to a grad student who will teach you for a lower rate (or a months' supply of Ramen noodles

)
Don't forget to listen to a lot of good music! Edgar Meyer and Gary Karr are great "classical" double bassists, as well as people like Chris McBride, Ron Carter, Scott Lafaro with Bill Evans, Charles Mingus, Paul Chambers, etc etc
Best of luck to you!
LM