For your first pair of skates I would say avoid the 2 wheel frames or antirocker setups(normal wheels on the outside and small hard wheels on the inside for easier grinding). Having a normal setup with 4 same sized wheels on each skate will allow you to roll smoother, allow the wheels to last longer, and make the transition from a flat(4 wheel setup) to a freestyle(2 wheel setup) much better.
If you start with a 2 wheel or antirocker setup, sure grinds will be easier at first, but if for any reason you decide to switch to a normal 4 wheel setup you will have a bitch of a time with it. Starting with the 4 wheel setup will allow you to learn grinds on a smaller grinding area and then once you move up to a 2 wheel setup you will really notice the difference and it will help you progress further.
For the thread creator, if you plan on hitting more ramps than rails I would strongly recommend a standard 4 wheel setup for better speed and less wear on the wheels.