Is there a way to do a script for an NPC where he attacks you if you have a weapon in you inventory at all, not necessarily equipped but in your inventory? For example a throne room where you have to lay your weapons on a table before entering or the guard kill attack you.
Also, this may be even more complicated but is there a way to do the same as above but with only certain weapon types. (for example if it is at all possible I was planning to have all weapons be detectable by guards except short blades so an assassin character could smuggle one in).
-I don't know if either of these are possible at all and I am a complete noob at scripting so any help or advice would be great.

Not possible with MWSE, unfortunately. With MWSE, you can iterate through all inventory items and scan for weapon type items, but it will cause a pretty good slowdown if the player is carrying a lot of stuff.

I would recommend having the guards require the player to not have a weapon readied, and to respond immediately if the player draws a weapon. That's much more common in games (because of the reasons above) and works roughly as well. It also leaves the role-playing option open to players carrying boot-knives, punching daggers, etc.

of course it would be possible to do a "if ( player -> GetItem Count "item" != 0 ) on every weapon listed in vanilla morrowind and just exclude the short blades, but that would take a very long time and weapons from other mods would still be present. the script would also bring the game to a standstill for several seconds (speaking from experience and a computer that can run crisis on high)
sorry I couldn't be of more help