Best is to only starty copying files once you understand the concepts completely and start with the unchanged sample app and start with the setup guide in the documentation and try to understand which classes / methods are doing what.
Also did you google the errors (e.g. Method does not override method from it's superclass when using @Override - which has nothing to do with the Wikitude SDK as such - it's more of a wrongly used concept). This is why I would also recommend to start with the Android basics.
Is there any specific parts of the documentation you recommend I look at, since I've tried looking over it all (I've been stuck on this section for quite a while).
We strongly recommend to start wtih the sample app and try to understand the code that is used there together with a deeper check of our documentation. Also if you're new to Android/Java development - most of the errors should be resovable once you're familiar with Android and Java development and concepts (e.g. if you search for a general rule on how to solve 'Cannot resolve symbol..' - we recommend to start with Android samples and studying the documentation, as unfortunately we can't provide any Android development support.