All the lenses you have ordered are very well respected and should be great for a beginnner. I only wish I had those lenses when I started out.
Anyway, if you purchased the 35mm DX lens directly from Amazon (and not from a marketplace seller) then returns are simple. I've returned a few things including 1 lens I bought from Amazon and never had any quibbles from them. The only issue which isn't really Amazon's fault is that Yodel are idiots and never turn up to collect returns.