Do you use different contracts for different states?

[Alicia Arizpe]

Okay so I’ve gotten a contract labeled “standard purchase and sale agreement” from an online wholesaling source, and I’ve also received the Trec 1-4 from an investor that purchases properties in Texas. I am in San Antonio specifically and am wondering which contract would be best to use? Are there multiple allowed? Do I NEED to have an attorney/legal representative with me when going over documents? What provisions should I be sure to have in said contracts to wholesale a deal? Is earnest money something that I pay if at all necessary to be paid? 

It’s a lot of questions, I appreciate you taking the time to read & answer these.