You can cook it like you would a brisket. Usually the corned beef is boiled.
Smoking it will take you into Pastrami
If you want, you can use a Pastrami rub. IF you do, and you are looking at buying commercial rubs, try and find one without salt, or as little salt as possible. The corned beef you have is already salted, no more required
Any rub you use should have minimal salt, and preferably no salt.
Here's the Pastrami rub I use
Pastrami Rub Recipe - Meathead's AmazingRibs.com
https://share.google/iCLDLQymrACp0iWL2
If you wrapped in butcher paper on your previous brisket, this time you'll probably want a foil wrap for the meat. You could even opt for a metal or foil pan as well. You will want to add a bit of liquid to the wrap so you braise/steam the meat to finish it.