Heat Pumps and Electric Heating - Adding Baseboard Heat

Thanks so much to whomever answers my question(s). This really is the best site!!!!

Ok so here goes....the previous owners of the house finished our basement. Did a great job but did not add heating to it. I don't want to sacrifice any air flow (from the gas furnace) to the rest of the house, so I was thinking it would be a good idea to add some baseboard heating. I know it can be ugly but with the current natural gas prices I can deal with the asthetics. That being said, I have two questions.
1. Is there some sort of formula to know how many feet of baseboard heating I will need?

2. How do I know if there is room on my electical panel? If there are slots that are unused, does that mean I have room?

Can anyone shed some light on this for me? Also, if you have any other tips to throw in, I will gladly accept any advice.

Andy

if you have a slot and the panel is same volt as unit you can use it most likely if one slot left id guess its 110v and you unit would have to be as well but check to make sure before you buy something. as far as what size unit for room try this http://www.houseneeds.com/shop/HeatingProducts/heatingunits/electrical/kingsizing_baseboard.htm