Ive been given a Ipad through work and want to transfer all my ,PDFs ,word/Excel files on to it.Ive just tried a PDF and used iBooks to view it

Is there a all-in-one App that i can use to view PDFs,word,excel etc

On my Laptop ive grouped files/docs into Different Areas i visit IE:
London Folder = 2x PDF 3x Excel 10x word docs
Hampshire Folder 4x PDF 1X Excel 7x Word

Can i do this on the ipad or do all the PDFs get associated with 1 app and all the Word docs with another app??

Sorry im new to this ,ive had a iphone but only used it for Calls/text/photos and Browsing/FB

thanks