High Interest Rate Investment Los Angeles- Whats The Best Way To Approach Angel Investors With An Idea That Will Have A High Return Of Investment?

Angel normally means an early stage investor who has some domain knowledge or expertise.
They will care a great deal about how well thought out the idea is. That means taking the time to write up the idea, to demonstrate the work completed so far and other evidence that there is something there. Angel investors are not looking for a zero risk proposition and they are early stage so not all the possible questions need answers.
Expect that an angel will likely want to be more involved than other investors so expect someone who could end up as an adviser and frequent visitor. Make sure they are someone who understands and with whom you want to work.
All investments that angel investors make are expected to be high return if they pay off at all. At the same time offering too high of a return could be a sign that you have not done your homework as to the costs, the time and the risks.