Adding to what 21st century pict said:
When you have your bow at full draw and are aiming at your target, line up the string in your field of vision with the left hand of the bow (if you're right handed), along the area above your arrow rest.
combining this with keeping a consiistent spot for your hand on your face at full draw will give you a point of reference to make sure the relative positions / alignment of your eye, bowstring and bow stay consistent from one shot to the next, I can't stress enough how important this consistency of alignment is to accurate shooting, with or without a sight.
Also don't grip your bow with your bow hand, if you have to grip it at all use your thumb and pointing finger to make a ring that your bow sort of sits on top of, when you grip the bow you can inadvertantly twist it a little, throwing off your shot.
Rather than "holding" the bow let it press against the palm of your hand as you draw it back.
It helps if you gently spread the bottom three fingers of your bow hand, or you can curl them and rest them against the side of the handle.
Don't hold your bow hand upright, it should help if you twist it clockwise a little (right handed), try to let your bow sit in the natural groove that runs down from the space between your thumb and pointing finger, across your palm to the butt of your hand. Your bow should stay upright.
When you have your bow at full draw relax both shoulders, any tension through your arms and shoulders can lead to you snatching the shot as the arrow releases. Try not to "push" with your bow arm, let the bow rest against your locked elbow joint, the aim is to reduce muscular tension as much as possible, smoothing out the shot.
I like to breath out and relax, then hold the breath, as you would with a rifle, I find this helps.
There's a lot to think about all at once, it will get easier with practice.
Lastly and most importantly, DO NOT go out shooting in the woods, join a club and learn about basic safety, failing that get permission to shoot on some private land. You could land yourself in all sorts of trouble.
Hope that helps.
R3XXY