Hi, I have recently finished building a CNC machine I saw on instructables and all I need now are the motors and the "thing" to connect it to the computer. I do not know much about this subject and now I need to know what motors to buy and the "thing" to connect it to the computer.

I have seen that there are different types of motors. There are the normal motors one sees everywhere then there are the "steeper" motors. I dont know how strong the motors have to be, how many watts...

Also, according to the motors, what would be the best "computer controller thing" i could use?

My cnc machine measures 30-25 inches

BTW, I need the cheapest possible parts