Simple, you need at least three years of audited real money trading statements at a real money trading firm. Anyone who entrusts their money to someone based on backtested results or real time (but not real money) trades on some trading board has no comprehension of the money game.
You will not find a backer unless you have serious skin in the game. And the software and your time or sweat equity does not count. Every trader i know or met who started a fund put at least half of his asset worth into the fund. Don't bother to float a prospectus without it. You are also going to need some professional trading bona fides.