Basically just waht to have an update romset that has fixed/update roms of existing games and also new games that have been added
Ah gotcha. For that purpose you’ll either need to periodically locate and re-aquire your collection or learn to use a tool like ClrMamePro which is what I use to keep my romsets updated for MAME 2003-Plus.
There is an introduction to using ClrMamePro for this kind of purpose over in the RetroPie documentation: https://github.com/RetroPie/RetroPie-Setup/wiki/Validating,-Rebuilding,-and-Filtering-ROM-Collections
That is the best resource I know of for getting started rebilding romsets. It’s not written specifically for MAME 2003-Plus, so I can help translate anything to this exact scenario that you have questions about.