A father wants me too babysit his 3yr old son he would need me to babysit from 7am to 6pm during the week I don't know how much to charge because I don't want to charge so much it would be at my house with my son there also who is 2yrs old please need some help?

Here in Atlanta you could expect to charge 200 to 300 dollars, since you are looking at 13 plus hours a day ( assuming 5 days a week)
Also remember to add this baby sitting to your home insurance so your liability will cover the child while you are watching them.

Also, if in the U.S. you could do the following type of search and maybe see what others might be charging. The link below is for babysitters that advertise on craigslist.org. If you put in your location or a large metropolitan area into the search, it is likely that you will find those that are advertising near you.

Babysitter craigslist.org - Google Search