Right now the servers have been having problems with photos so it may not be your problem. I haven't posted any in a while so not sure if that has been fixed?
You picked a very good first build and GP has great instructions and photos. Ken did a great building thread and Minn has a great article on why build or building 101.
Your radio is a good one and should work very well.
Covering, Just do a search and read the debates then make your choice. After you have covered a couple planes and tried the two main coverings, Mono and Ultra you can make up your own mind. I started with Mono and went over to Ultra but I still use them both, Mono for trim and Ultra as the main usually but I have been know to mix the brands more then once. Any of the TEX coverings are really easy to work with but have some quirks of there own.
No age limit on anything RC. Almost all my flight students have been 60 or older, slower to learn but the older you are it seems the longer you stay in the hobby.
When I teach building it has been young kids all the way through up to about 70+ so I think you are safe!!