aight, tab's are easy to understand. lemme give u a simple one:
G-----------------------------------------------------------
D-----------------------------------------------------------
A-----1111----4444------------------------------------------
E-1111----4444----------------------------------------------
that's the verse riff for "smells like teen spirit" by nirvana, one of the easiest songs to play and actually sound like you're good. it was the first I learned to play. anyways, the only hard thing to understand about tabs is that it's sorta upside down. although all the #'s are at the bottom of the tab, that means that u play them on the top of the bass. your E string is your lowest and biggest string. your A string is your second lowest, and then your D and G. this is due to the fact that your E string produces the lowest notes, so it is at the bottom of the scale. that is why it's at the bottom of the tab. it's just a lil thing left over from sheet music. now the rest is easy. after being taught to read sheet music, reading tab almost seems like cheating it is so easy. the #'s represent which fret u play. use the dots on the fretboard to help u out on figuring out where to put your fingers quickly. the first dot is your 3rd fret, the second is the 5th fret and so on. it skips 2 frets after the ninth fret and then the next dot is on the 12th fret, where it starts all over again b/c it is another octave. ok now that may sound complicated, but if u don't understand it now, trust me u will later on if u keep up w/ it. it's not really important right now. about the scales... well to be comepletely honest w/ u I have no clue about scales. I've never found any use for them. I just get tabs, and learn songs. once u think you're good enough, try to learn "what if" by creed, that will test your skills =) it took me a week of playing nothing but that song until I finally got to where I could play it perfectly. it just takes time. and believe it or not I've only been playing for 10 months myself. just don't worry about sheet music, that stuff is way too complicated, and really has no relevence to bass playing, especially when u have tabs! but if u really want to u can learn the notes on a bass, like if u play the 3rd fret of the E string then that is a G. but hey u really don't need to know that. I just know that stuff cause I play for a praise and worship band, and they don't use tabs... which sux! well I hope I've helped some. if u want anymore advice just email me.