Help for fantasy football on picking rookie players?

I really like Mendenhall and Jones. Both of these guys are going to very good teams. They were both drafted in rd.1 and they will both be utilized in all of the games this year. Mendenhall has the best upside in my opinion. Parker is coming off of a bad fractured leg and if he isn't healed properly Mendenhall may get a start or 2. Also,Parker is not a good short yardage or goal line back but Mendenhall is and he will get a ton of work inside the 5