wholesale process questions

[Jef A.]

I have a few questions regarding the wholesale process.

1. when i get the property owner to sign the contract do i need to have a notary present to confirm the identity? Also if there is multiple names on the property deed do i have to get signature of all those people?

2. Once property is under contract if the cash buyer wants to visit property should i try to avoid buyer and seller meeting? i am thinking the cash buyer might try to negotiate with the seller directly and steal the deal from me. 

3. If i use $100 to start the escrow process after getting a signed contract if the deal doesn't close within the allotted time do i loose the $100?