It kind of depends on your specific field of interest. Obviously, public repositories such as the SRA will tend to have requirements of the information you submit to them.
Are you aware of the work of the GSC (http://gensc.org)? They are interested in meta data minimum standards (specifically for environmental sequencing) but a lot of the standards they have developed are applicable to other areas of genomics and NGS.
You might find it useful to read the following papers: http://europepmc.org/abstract/MED/21552244 (about the MIxS standards) and http://europepmc.org/abstract/MED/21713030 (about GSC) And specifically, this part of the GSC website: http://gensc.org/gc_wiki/index.php/MIxS