When you have what you think you need, load up you bike and do a weekend shakedown tour. If you are camping, camp at Youth Hostels, so you will always be near to help and convenint facilities. (You can even just ride the loaded bike back home and camp in your garden).
Take the bare minimum load, but everything you need. The art of packing is to leave stuff out.
There are plenty of packing lists, such as:
http://www-math.science.unitn.it/Bik...king_List.html

In bike-shop country, some of the tools may be left out, esp if you dont know how to use them, but try and learn to fix the bike yourself.