1) Talk to some friends. Tell them about your trading approach. Tell them that you need 5k. They can share the investment. Tell them that you prove your approach with a demo account for some months.
2) Do this demo trading and prove that you can trade consistently.
3) Collect their money and make profits for 6 months.
4) Take this track record and show it to some investment banks, hedge funds, or wealthy people.
5) Make millions or burn everything.