Most people start a ham by putting it into the oven. I believe you mean when you get your amateur license.
While you can certainly build a 2 meter and/or 440 beam, there are so many of them for sale used, you'd save money by buying one used. That said, using a beam mobile in motion can be done, and you'd be far from the first. The problem is, antenna rotor motors are almost always AC, so adapting one is a little difficult.
The last one I saw was adapted from a windshield wiper motor, and worked quite well. The beam was an 11 element 2 meter unit, in horizontal position for SSB work. If you're interested, I suggest www.allelectronics.com
. They sell the WW motor, cheap. The rest of it you have to design.