Auto-entering names and addresses on contracts

[Devil]

Hello,

In our office, we frequently dole out agreements/contracts. So, things like "OUR COMPANY" and "CLIENT NAME" of "COMPANY" and then on another page number, their address, etc. And finally the signature area with their name printed.

How can I automate this it's a one time thing where you enter name, and all these required fields and it automatically fills it out and then sends it to the printer?

As an added, maybe the name can be printed on an envelope template and get that saved as well?

Help would be appreciated to accomplish this.
Thanks!