Whispers

Since you'll only be starting, you won't need to be able to kick very high inthe beginning. For the first month or so most instructors will only want you to kick at or slightly above your waist. This doesn't mean that you want to begin training now and your initiative is a good sign of things to come.
I recomend doing hurdle stretches(where you sit down with your leg out and your foot up and try to reach your foot, if you can do so, grab hold), both the one and two leg versions. You'll also want to do butterfly stretches (you sit on the ground and put the soles of your feet together, grab both feet at once and draw them intoward your groin, pushing down on your knee's with your elbows by leaning forward), also sitting side splits(where you sit down and spread you legs as far as you can and begin by leaning to one leg as far as you can, taking hold of your foot if possible. You then do the same on the other side and in the middle. You can also finish by going from one side ot the other slowly). Also you may wish to find some object in your house you can use likea ballet stetching bar. Simply place your foot on the object and slowly lean forward until you feel that the leg is being stretched and hold that position for a period of time. I personally stretch 4-6 times a day (morning, before bed, before work out, after work out, before class, after class) depending on whether or not i work out or have class. In the beginning it's only nessecary to stretch 2-3 times a day. Also besure to stretch your back, especially the lower back, trunk rotations are one method(keep the pelvis still, place your hand on your hips and move your torso in a circle, first one way,then the other).
More than welcome and I hope I helped. Contact Spooky or myself if you need more help or have more questions.