Question about Cluster 3-Nodes

Hi All

We are creating a cluster for a customer so we can set up SQL Availability Groups. My scenario is this:

Site 1 = 2 nodes

site 2 = 1 Node but i will set this up for no votes because its A DR site and i don't want it to become primary unless i manually failover. 

Site 3 = Witness file share

My question is this.

1)Do i need the witness in my current configuration of 3 nodes if i put site 2 as no votes. 

2)Should site 2 only have 1 node or should i have 2 nodes both with no votes?

Thanks and any other recommendation or tips would be greatly appreciated