If the Texas site confuses you, call them up and ask for help.

Roofing Contractors are typically good at providing a quote on-site or at least within a couple of days of visiting the property, so it's worth taking an extra few days to get some additional quotes.

Hi gang,I've scoured the site & forums for the following agreements and legal docs for working with contracts, but can't find them.

@David OlsonI am in no way an expert at this but I believe when you are making a cash purchase the main team players are:Attorneys, Title Company, Inspector and Appraiser (occasionally)Attorneys: Using legalese to get the purchase contract in writing Title Company: Perform due diligence to make sure there are no liens against the propertyInspector: You already covered thatAppraiser: To determine the price of the property at its current state and after repair value.

Private massage me on this site or text me at my number below and I'll directly pass the point of contact to you.

At BP, not only can you network with other real estate investors, you can learn from the informative forums posted daily on the site, find properties that are for sale, and take free courses.

As Is" simply means the seller is not agreeing, in advance, to performing any repairs typically that may be required to be in a financable condition. 

and why the broker only list this particular property on loopnet, while other listing was on multiple site?

Some people get impatient and buy crap properties.It is better to not buy anything than buy a property marginally performing with bad debt on it.

Then check their reviews on all of the sites and their transaction history on Zillow.