Your writing style and comments you have made suggest that you are a young person (which is great, by the way). The knowledge, experience, relationships, and capital required to become a partner that customers would find you worth doing business with, is a few years in your future; particularly for expensive and service-requiring equipment like mid to high-end consoles.
I purchased a new system earlier this year from a local production/sales company - mid $xx,xxx range. I know approximately the markup on the deal, and it's a few thousand dollars. At first glance, it sounds great:
1. take the customer's money
2. pick up the phone and order the stuff
3. customer picks up gear
4. profit
In reality, it's not quite that easy. My dealer/friend brought boxes in to do a demo for me, which took about 6 hours of time with himself and an employee, not including driving around the city collecting parts. He took probably a dozen long calls from me over 8 months of thinking, spec'ing, saving, and finally executing (and my executing wasn't guaranteed - he put forth the time just hoping for a sale). After the sale, he has loaned me spare parts from his rental inventory twice, and provided some technical support. His out of pocket costs were hundreds of dollars paying his employees to help me, and a couple thousand worth of his time and equipment rental that he gave me as a package deal. Unless you can give service that's just as good with a rental inventory to back me up, I'm not going to be buying gear from you anytime soon.
If you are truly interested in pursuing this, get a job at Metro Sound or one of the other pro-audio sales/service shops in the city here, and learn the business.