You can always read through the documentation that WordPress.org has put together on Creating A Network.
The point below was taken from Step 1:
“Also deactivate all active plugins. You can reactivate them again
after the network is created.”
After the network is created I recommend activating your Plugins one by one and testing your site each time you have activated one
Site note: Also make sure you backup your database before you even start doing anything with MultiSite
Best of luck 🙂