Thinking of getting rid of my laptop
Yes, you should be able to do all the things you asked, provided you have the correct apps on the iPad.  It's easier to do these things if you keep your docs in iCloud instead of the network share, though.

For instance, I have the MS Excel app and I store all my spreadsheets on a network share or on iCloud.  I can do almost everything I need to do thru the app.  I also have Emby and Plex apps to watch all my movies on the network share.