1) and 2) Yes, make sure the system is totally up to date. Should not need to reset the PC as you would then lose all installed apps.
3) should not need to install apps as they are already there.
As far as the install disc you can't unless you have a Blu-ray burner or use a double layer DVD as the Windows 11 install will no longer fit on a normal DVD. Use a flash drive for making the install media. The flash drive must be formatted as NTFS and be at least 8 GB in size. If the system fully qualifies as to hardware requirements you should not need to do anything special but make sure that the system is on-line or the install will fail at 86%. Use the Media Creation Tool from the following link and have it make the media to the NTFS flash drive. If doing an upgrade install launch the setup app from the created media. If doing a clean install boot to the install media. Note that, if the system has never had Windows 11 previously installed. you will need to purchase a license.
Here is a link to download the media creation tool.
