Don't your treadmill have these built-in programs that you choose from? I usually just use those presets but I don't know I don't use the treadmill often, I just jog in a park or in a track.
My advise though is start with slow speeds then gradually increase over time.
Sprints or huge bursts are not recommended for starters as it will "shock" your body.
Don't worry with starting slow because in time, your body will get used to running and then you can do faster speeds without a sweat.
Oh and one more thing, sprints and inclined planes make your calves bigger so if you don't want a muscled calf, I suggest stay low (maybe a maximum of 2 or 3 inclination) and don't overdo sprints.