Hmmm, let's see...
The nice thing about armor is that, you can usually paint it all at once, when complete, you won't have to paint it in sections (like most aircraft)
You can leave all the excessories off and add them later or paint them the same color as the armor.
If you do a little forum search ,about the best first kit to buy, you will come up with a good selection. I would suggest starting with a Tamiya kit. The Sherman is a good choice. If you want German armor, the Panther Steel Wheel or Early Tiger can't be beat.
I would suggest that you should start with a one, that has a 1 tone camo pattern. Examples: Early Tiger in Panzer Grey, Sherman in O.D. Green.
Keep us posted and good luck!