Use the Storage menu to check how much memory you have available.
You can later move the apps back to your phone from the memory card.
The type of the memory card may affect how long it takes to move large files to the card.
If an installed app depends on a removed app, the installed app may stop working. For details, see the user documentation of the installed app.
Make sure you put the files in the right folders on your phone, or you may not be able to see them.