For tips and pointers, I would list a few:
1. Try to always hunt this method where you are quite sure deer will be at the time you are moving through. Fresh tracks crossing a road or field into the area at first light may indicate that deer have gone there to bed down.
2. Best case scenario is with the sun at your back and the wind in your face. Lesser preferred will be with the wind crossing, but NEVER at your back. Either approach from a different direction, or wait for another day.
3. Plan on moving verrrrrry slooooowly. Most of us find it almost impossible to advance ony 2-3 very careful steps and then stop for 2-3 minutes while we scan every square inch ahead of us and to the sides. But this is what it takes to get within bow range of a deer. It seems like it's a waste of time, but try moving faster, and all you will see is tails from 50 yards or more. A good thing to remember while you're moving slooooowly through an area is that the view is constantly changing; it's always the same when you're sitting in a treestand.
4. Look not only at the woods/foliage, but through it. A good pair of compact binoculars are invaluable for this. They force you to slow down while you pan a 270 degree area before moving slowly forward some more.
5. Be sure you don't make the mistake of looking for whole deer or too high off the ground. Look for parts of deer; the horizontal line of their back, four legs, the glint of an antler, the flick of an ear or tail. Remember that deer only stand a bit more than waist high to a man - don't be looking for them at eye level.

Good Luck and enjoy this fascinating and rewarding style of hunting.