How much should I charge to mow a lawn?

I am 15 years old. I have a riding mower, push mower, and a weed whacker. The yard I would be doing is medium to large size. First I have to pick up a fair amount of sticks. Then, I would take the riding mower over the front yard but would have to push mow the whole backyard. Then I would have to use the weed whacker over multiple areas. Finally, I might have to use a blower to get the grass off the sidewalk. This is a corner lot. I would also have to take all this stuff- 2 mowers, buckets for sticks, and the weed whacker- over to the house which is 5 houses down from mine. I want a fair price.