communication with photon server

Hi, i am make my first online game using photon and unity.

While i have some problem on the data sending between client and server.

I hope i can get some answers or suggestion here, thank you.

1.)I am taught to use

System.Threading.Thread.Sleep(500);

so that the CPU can be release to do other task,

but will it make 2 client not synchronizing?

2.)For the movement of character, what i have to send to the server?

The moving direction or the actual position of character is more preferred?

If there are some data lose in transition, will the character in different position in different clients?