The manual is online. There's a link in my signature to get it.
You should get a charger with cable and a SIM card tray tool. The small amount of paperwork supplied with an iPad, you can do without. Just use this forum to get you started. Our members are better than any manual.
It's a good idea to restore it to factory settings. That will clear out any personal info from the previous owner and allow you to input your AppleID etc
If its jail broken and you want to keep the jailbreak, ask in the hacking section how to proceed.