can anyone give me good offensive moves for when i close in on a target?
Feints, jukes, aggressive shieldwork, anything to distract/overwhelm them. A lot of the time, I wind up throwing a short cross to their sword-side shoulder as I close -- I rarely score a kill, but I force them to defend with their sword instead of attacking me with it.
Pocket stabs fill a similar function, and it's also nice and easy to transition out of a pocket stab into a shoulder drop/leg chop/deep wrap.
Note: the above assumes same-handed fighters, both fighting blue and medium shield, because that's what I fight a lot. If I'm two-sticking or the opponent has a larger shield, I switch it up a lot.