We can't really give you EXACT numbers for you attributes. But if you want to be a solid coverage LB, you need to spend points in the minor and major attributes. The major attributes are the CORE attributes that all LBs should be solid in SPD, AGI, and VIS. The minor attributes that you should spend points in are JMP, TCKL, and CAT. Now if I had to put these 6 attributes on a list of most important to least important they'd be something like this:
SPD, AGI, VIS, TCKL, JMP, CAT.
Don't worry about SAs until you are around level 16. They aren't worth your time pumping points into them early. Work on those 3 CORE attributes, and then those 3 Minor Attributes a solid amount to be a really good cover guy. Now if you want to be all around, add some STR into there as well, about the same as TCKL.
Good luck on your build man and welcome to the forums!