Wholesaler working with Off Market Brokerage Co.

[Jazmin Purifoy]

Hi BP Family, 

I recently came in contact with a agent who works for an off market brokerage company. Being a newbie I didn't realize there where companies that solely worked with off market deals. Their properties are not listed anywhere, and I have to come into the office to view their property list. 

They are asking for due diligence before putting the property under contract and I'm sure that's where I come in, virw the property and determine if its a good deal to hand over to a buyer. 
what's my best plan of action?