I' m assuming you know the area where you' ll be hunting so you have at least an idea of where you want to begin.
Personally, I' m a big fan of fallen down or broken trees as makeshift blinds. Especially ones with a lot of branches on them that provide adequate background cover. Nothing is worse than getting caught out in the open with nothing behind you. Even if you have to sacrifice foreground cover a bit, I believe background is the key.
If you can' t find a fallen down tree that works for you, try sitting at the base of a large tree. But instead of sitting in front of the tree and looking where the deer are going to be coming from, try getting to the side or behind the tree to cover yourself a little better.
Also, be sure to clear out a BIG area to sit in. Kick the leaves and twigs aside so if you have to move around you don' t make any noise. Personally, I like kneeling down when I' m hunting from the ground. Being lower leaves less for the deer to look at and still provides me with adequate mobility to turn and position myself for a shot.
Just like in a treestand you' ll want to watch the wind, that is a given.
And most importantly - HOLD STILL!
I shot my biggest buck from the ground at 15 yards a few years back and he never even knew I was there.
Good luck!
EDIT - Make sure you' ve got a set of hand clippers and maybe a small saw to cut out shooting lanes for yourself. Having to break off branches in the dark or at fist light is never a good thing.