Are you sure you're ready for $100NL? Your question seems naive at best, and as for what bb/100 to aim for - well, you aim for as much as possible! It's a by-product of good play, not a cause of it!

There are a huge number of excellent posts on all elements of no-limit poker - it's probably best to spend your first few days on FTR reading (and contributing to threads if you like), but such a vague question is basically unanswerable. - there's just so much more to the game than an "ideal", and it's unrealistic to have one in mind.