Some quick thoughts:

- Option A. Bootstrap and get to the point where you can pitch VCs by yourself

- Option B. Build a reasonable MVP, collect some metrics and join an accelerator with a good track record (obvious example is YC, but others exist); some metrics to judge them: average money raised after the program, average pre money valuation after program

- Option C. Family and friends!

- Option D. Good old social networks: you cannot imagine how many angels write "Angel investor" in their bio on Twitter / LinkedIn / etc