You need astral combat.
And imo it is kinda pointless for an adept to fight things on the astral. Either those things want to hurt you, so let them come to you where you have the advantage, or they just want to shadow you in which case you as an adept can't do much about them as fully astral being can simply move upwards, go through walls, move much faster than you and do man other things to avoid combat with you as you are still limited by real world physics.