There are many services to open a fan page for customers, but they do not take care of the personal profiles. Each company with business page use ( or need to use ) it in order to market and raise sales. But the power is in the employees profiles on Facebook. Learn to manage them in FB, to raise the company profile and you are on the right way G luck
Business pages are more useful than profile pages. Thats my opinion, You can have unlimited number of fans per page, no fans add rate. But you can only send maximum of 20 Friend requests per day. and maximum of 5000 friends per profile...
Don't try involving your profile page for advertising, i am banned permanently for doing that. It was my other facebook account though.
Facebook personal profile accounts are for friends and family,not for business, you can check their terms and conditions. And Facebook is very strict so they will set down accounts that violet their terms.
I never using fb for marketing, I think it will be difficult although there are many people said that they makes a lot of money..
FB is the beast place to do marketing, you can target your ads based on users real interests. Not like google ads, Fb is more active and interactive place.