sup guys, never had a Mk3 before so be plz be gentle when takin da piss if some of these questions a stupid

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I got myself an R plate 5dr in black... which is more desirable 5dr or 3dr?
Wipers (front + back)look hanging so gonna replace....can i replace with Mk4 or not?
Door has been screwed, gutted

.... will Mk2 door plates fit?
Back box lookin sad but want to keep car standard`ish... ideas plz.
I`m sure these loads to find out about this model. Any thing you can think of that might help would be welcomed.... Cheers all.