Welcome
Sounds like you have some good mods planned!
Best advice is to plan your mods carefully.
Try not to impulse buy
(good luck).
Try to get advice and opinions from the forum before parting with cash!
You will learn loads, and potentially save lots of cash here...
Or you could turn into TFSiMike
(Awesome Cupra
Few nuts and bolts....but not many parts left to Modify on it)