I really want to get started.

I have a big library of files on a HDD. I will run it off my home computer, and it will be exclusively for my home network.

Question 1: Is it fine to run my desktop computer as a server and a client? I don’t actually know how Plex works yet, so I may be describing it wrong. Currently I watch things on my Desktop Computer. I want to continue this but through Plex instead of just using VLC. If I do add more clients, only one will be viewing at a time. I do have a Raspberry Pi available, but was hoping to use it as a client at a later time instead of a server,

Question 2: Can I scan my media folder in Plex to get started, and then later rescan my Plex library after I rename files? I haven’t reorganised all my files yet, a lot of them should be fine but I don’t have time to do it all now. Some of them I may never bother renaming or reorganising. I don’t mind Plex having to do all the posters and stuff again.

Question 3: What does Plex do for the re-encoding? I think I read that Plex encodes the video files. Does this create new files on the HHD? My drive is pretty full. I don’t have enough space for duplicates in another codec. Does this process replace the files? Will I have to have my Plex drive only contain converted videos? Is there a process to encode from my storage drive to my Plex drive without disturbing my storgate drive? Space is at a premium and I don’t want to risk Plex altering my media on my storage drive.

Thank you.