Newbie.. Contract confusion

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Hey everyone- My name is Connor and i am 19 years old, just starting to really learn about wholesaling and how it works. I have read up on a lot of it, and watched some Youtube videos, but i am still not sure of exactly what contracts and agreements i should be sending the seller and the buyer. Do i need to send just an assignment of contract to the seller and the buyer or should i be sending multiple documents? If this has been discussed in a previous post, please send me a link to it if possible, because I'm clueless as to what i would have to search to find my answer. Looking forward to learning something from everyone on here. I am open to any advice or tips. Thanks.
-Connor