Having ADD your going to go through 100 different practice routines in the next year (if your anything like me)
Remember though, having ADD is the best thing for a musician. Practicing is a pain, but your far more creative then our non-ADD (or ADHD in my case) bass playing counterparts.
These are things that work for me :
You need to learn to play without looking at your fretboard, and watching TV while practicing scales and chords is great for this. Your ear will pick up the scales or chords your playing. Play them enough, and you'll have a keen ear when you hear a piece of music.
Do things you normally do in your adhd filled "relax" time. If you surf the web for 2 hours, surf it with your bass on your lap, plugged in and ready to go. With that big distraction right on your lap, your bound to pick it up often. Then being on the web you'll look into tabs or standard notation, its just bound to happen.
NEW MUSIC! Learning a new songs a pain, but once I get all the notes, finding the right rhythm they go in is just a blast. New things for people with ADD is really attention grabbing, usually the more challenging the better. Only problem, is once you play something enough, you'll most likely get sick of it.
Finally, get a space where your bass can easily be set up and broken down. Having to get up, go across the room, move some books, find a place to put them, then take your bass out, then find your chord, tune, plug in the amp, ect ect, can get really discouraging for you to want to pick the thing up to practice. Put your bass, amp, and tuner in a place that is easily accessible, and somewhere where you find yourself most in your room/house.
I suggest learning your C major scale, then be able to go through the circle of 5ths and 4ths. Do this enough and you can do it without looking. Put some music on, put the tv on for backround noise ( we all know how much we love white noise) and go through your circles as your warmup. Do it 4-5 times. You use all your fingers to play a major scale, so it gets you all loosey goosey. Then do the same thing for the inner circle (minor scale / aeolian mode), then the rest of the modes (Dorian, Phygian, ect ect)
Well these are all things that helped me, get some adderall, and practice your ass off for 5 hours

but when your not on the meds, or if you dont take them, try all that out.
Good luck,
-Troy