Why don't you worry more about learning how to use the equipment you already have?
Practically every woman on this board will tell you that size does not matter.
The pump can be dangerous. What is does is create a vaccuum that then draws more blood into the penis causing to to become temporarily bigger. It has very little to no permanent effect. I have read plenty of cases of guys using it and then not being able to get as hard as they once did.
Learn style over substance and you don't have to worry about it.
Jude29 is right, don't waste your time or money on something supposedly making your penis larger. I'm seeing more guys post lately about the damage done to the equipment trying to make it bigger with all this BS stuff being marketed. Contrary to belief, your penis is a sensitive tool that can easily be damaged....now you don't want that do you?