Due Diligence prior to making an offer

[Gurjot Grewal]

I'm currently analyzing deals daily looking for a great deal. Usually, if I believe a property has potential I will ask my agent 3 basic questions. Neighborhood grade, rental rates, does it need any repairs. This I feel helps me phase out many properties. 

But there is so much more I would like to know prior to making an offer. Some listings don't have any pictures. I want to request pictures to get an idea of the condition. I need to know when was the plumbing, electrical, hvac etc last upgraded. Any information to give me a better idea of how much to offer. 

I am investing from a distance so I feel it is vital for me to at least get this information. How should I go about this? I was thinking about making a spreadsheet with all my due diligence and sending it to my realtor prior to making an offer. Is this too much to ask of an agent I have not yet bought from? Is this too much to ask of a seller? Any advice is appreciated.