How can I make some famous actors READ my screenplays, although nobody knows me in this business (yet)?

Email it to them with a neatly written explanation, make sure it's someone who's sure to get someone else to look at it (someone with higher power). But if it's someone who you're sure gets about a million emails per day then don't bother, they'll probably just ignore it. But try to find an actors/actresses/directors/producers email address and mail it to them. Triple check the work and if they like it they'll get you an agent and actors and everything you'll need. But you have to make sure you're absolutely sure about it because some actors can be mean and tell you to buzz off, and you need to be ready that there is a risk they would steal the screenplay if they like it too much so make it copyrighted. Watermark it for sure ha ha. Good Luck!