i prefer to have my eyes half open and look down at a point on the floor just in front of me. i find that closing my eyes makes my mind wander more.
i usually sit in half lotus, with a pillow to lift my bee-hind slightly.
the important thing is to sit still for the duration. if the mind wanders, its no big deal. it happens anyways, just "un-wander" the mind again. i think that the wandering is supposed to be there, my wanderings are usually the processing of daily events and questions that needs resolving. after some practice, the wanderings diminish.
doing bows before meditations also helps, IMO.
or if i am playing the didge, the didge takes care of everything for me: posture, breath and focus.
and as it has been said above: best thing is to find a group to sit with.