In order to improve my skills I decided to embark on a project for which I
will be designing a new file format.

I have done quite a bit of searching, but the only two links I was able to find
which dealt with general File Format design are

http://www.magicdb.org/filedesign.html
and
http://decoy.iki.fi/texts/filefd/filefd

I was wondering if any of you have any suggestions, recommendations,
warnings, annecdotes you could share.

I would also be grateful if you could advise whether it is better to use
Big-Endian encoding or Little-Endian encoding.