Zapnologica:
i want help on what components to buy. I have attached a simple paint drawing of what i want to achieve.
Your drawing is not correct. You need either two SPDT relays that "switch" power, or you need four SPST relays in a "H-bridge" configuration, or you need four MOSFET power transistors in a "H-bridge" configuration.
Also, you probably want two control inputs: One for "go or stop," and one for "direction." If you use MOSFETs, you can also control speed with the go/stop input, by using PWM.
The TLE5206 is a 5A H-bridge through-hole part that might work for you: http://search.digikey.com/us/en/products/TLE5206-2S/TLE5206-2S-ND/1283081
It takes the place of the relays, assuming the draw of the motors is less than 5A on average.
You will need a heat sink for draws over about 2A or so, but TO-220 heat sinks are easy to find 