It is difficult for investors to invest with someone if they don’t feel that the other party is ready to pay, and sometimes it might be difficult to provide funds.
So, you should write the idea in Microsoft Word with full details and in every way, then keep reading it over and over besides getting to know all the problems. Until then, try starting small with your business.
There is another method called the torture test in which you can use the application and then write a file
SRS (Software requirement specification), which determines how everything works. So, with these two files, you can ask any investor to get approval as long as letting them sign a non-disclosure agreement.