RPC Calls in 5.1

I have a decent amount of experience with unity but am new to multiplayer implementations. Right now I am making a game with random tile generation. The problem is that the tiles are random for each player. I want the string of numbers to be randomized on the server and then sent to the clients, so that each players board is the same.

I looked into RPC calls but I don't think I'm comprehending them correctly. What would be the best way to achieve synced scenes using RPC's.

Specifically I am confused with how you make the calls from a client vs. a server... the documentation is worded kind of wierd.