~Need Help!~

I'm still sort of new to this program, but I have an idea that involves a player using a Key Item from their inventory to change between forms. (ex: a human transforming into a wolf, or transforming back into a human)

How would I be able to create a script like that? The player should be allowed to switch between forms at will. And, as a wolf, they have different attacks/equipment/etc.

I hope it isn't too complex and I'm getting my idea across easily!

Transformation could be handled a few different ways.  Assuming you don't want to track stats (etc.) differently for human and wolf forms, I think the best way to handle it would be the use of a State.

The State can, among other things, modify the character's stats, lock her old skills, give her new skills, change her attack type (e.g. have her use three swings of the "Claw" element while in wolf form), and a lot of other things.  The State cannot change the character's physical appearance (if this is something you want to enable on the map as opposed to just battle), but you can use the Change Actor Graphic event command to do so.

Finally, create a Common Event that the "shapechanging" item calls when used (use the Features box for the item to call a Common Event).  That Common Event should perform the Change Actor Graphic (if desired) and Change State event commands.

One important note - if you want this available during battle, I don't think you can use a Key Item.  Use a Normal Item instead - set the "Consume" property to NO and set the Price to 0 so it cannot be sold by accident.

If you're new to RPG Maker, you'll probably hit some snags along the way - that's fine, just post what you're having trouble with and we can show you how to do it.  But definitely get started on setting up this item and event first - it will help you figure out what you need to learn better.