How difficult is it to get insurance carriers to approve of a new surplus lines wholesale broker to write busi?

I want to get my 1-20 (Florida) and open a wholesale surplus lines brokerage firm. How difficult is it to get approval from insurance carriers to write business for them. I will not be dealing with the general public, but would be the middle man between independent agencies & actual insurance comapnies. My concern is being a new business, without an exisiting book of business, how likely are the insurance carriers to give me a shot at quoting & writing their products / policies.