1) What type and how many panels should I get?
as many as you can fit on the roof and afford to buy.
expect to pay ~$5/watt for the panels themselves, plus charge controller and installation. maybe more batteries, also.
i like the amorphous panels, as they are more effective in partial shade sitauations and there is no glass to break like on cyrstalline panels.
amorphous panels cost about the same as crytsalline per watt, but take up more space, as they are less efficient for a given surface area.
flexible amourphous panels are available which could simply be stuck down to the curved surface of your roof, but you pay quite a premium for those compared to regular framed panels (up to $10/watt).
4) I'd assume I need a voltage regulator/charger for the panels. What type would be recommended?
yes, you'll need a solar charge controller. preferably with MPPT and battery temp probe for most effective charging in all conditions. expect to pay a couple hundred bucks for a good one.