LED Light strip programming help

I am trying to program 3 RGB LED strips on one arduino. I am somewhat new with electronics. I notice that I will need three vin pins to run all the strips, but the arduino uno only has one of these pins. I also need three more analog pins to run the third strip. Would it be worth it to buy a mega? Or is there an easier alternative?

You clearly don't have much idea what you are doing at this point. My advice would be don't connect anything to anything else until we have checked your schematic. Otherwise you will probably damage something.

We will need details of these rgb strips, a link to where you bought them, details of type, voltage, length, number of leds etc. Also details of how you intend to power the circuit, details of the power supply you are thinking of using - voltage, max current.