1.Business and trade section
2.BSF, but they wont fund you unless your company is already on its feet with employees a topic and several RPs
I wouldn't advise BSF for a small business, people can work for free.
May be useful for advertising but a lot of paper work.
Dear Georgef,
Consider the Courts - Economical if copyright is needed, the creation of a contract, and business agreements etc.
It may be a shocking finding to you but such enthusiastic role play already exists, welcome aboard.
People have been running business's without a in-game building

they usually come afterwards.