Need help with making Offers Electronically -1 page contract

[Robert Blocker]

Hello Im a newbie investor just started my direct mail campaign a few days ago and today i received 2 calls so far. One of the callers are interested in selling his property to me. I want to make a offer to him Via email and see if i can get him to sign the agreement. The problem is i do not know how to send a contract via email for a person to sign. How would i go about doing so, i have the contract template already, must i insert it through docu sign or??? kind of lost at this point