I have been produceing fashion shows and plays for the last 10 years+, now I would like to start my own talent agency. Can anyone give me any insight on the How"s?:)

Well one of the first things is to learn to read instructions. The Forum Help area (where you posted this) is clearly marked as a place to ask questions about using this site. There are dozens of forums with specific topics to choose from. I've moved this to small business since that seemed most appropriate.

The first steps in starting any business is to create a business plan. You will find score.org and sba.gov to be helpful sites for preparing a plan.

For your specific business, I would imagine you would have to develop contacts with the people who would use talent; producers, casting directors etc. Then you would have an outlet for your client's talents.