I want to open a new brokerage down in SD. I don't have my broker's license yet. I have a few questions I hope you guys can help answer. When I do open my brokerage, should I go with an LLC or S corp and why? I'll won't have any agents under me for the first few months.

My next question is: can I get a business license before I get my broker's license? I won't be doing any business but I'd like to try and start my tax writeoffs. Can I write stuff off that happened before getting my business license that was relevant to starting up the brokerage?

Thanks in advanced for the help