Esperanza Spalding says that no one really "teaches themselves." If you're learning from a book, from internet tabs or youtube videos, from listening to recordings and trying to reproduce what you hear by ear, you're still learning from other people - just without them being in the room with you.
I think the most important thing is having a regular practice time, preferably daily. It's better to touch your instrument for fifteen minutes every day than to have a marathon three-hour session and then not touch it for a week. For me, I started getting up an hour earlier every day and practicing through headphones while the rest of the house was asleep.
Split your time between technique/theory work and learning songs. By technique and theory, I mean stuff like fingering exercises and scales; that's the stuff that really gives you the skills to be a better musician. Learning songs, of course, is more fun, and is presumably what you took up the bass for anyway, right? Do nothing but theory and the whole thing becomes dull and academic and discouraging; do nothing but songs and you're stagnant as a musician and can't branch out beyond "these are the songs I know." So do both.
TAB is controversial. I used it a lot when I was starting out - I had a big three-ring binder of printed out TAB transcriptions of songs. Personally, I think that was fine. Following a TAB showed me a lot about how to use the fretboard and how great bassists built their lines. At the same time, you don't want to be overly reliant on it. Much of what's on the internet is incorrect, and a person who only learns from it can become a "tab monkey," who fingers the frets in the order the TAB said but doesn't really understand what notes they're playing or why and can't do anything they don't have a TAB for. Learn your theory and try figuring out songs by ear so that you can wean yourself off the TAB. I hardly ever look at one any more, though once in a while there's still a tricky bit where I will check to see how others are interpreting it.
Have fun and good luck!