A solution using pdfpages
This package lets you include pdf files in full size, unlike \includegraphics. It also supports a few experimental features, including custom page style and table of contents.
Custom page style can give you the page numbering you want, if you set it to be the plain style instead of the default empty.
\usepackage{pdfpages}
\includepdfset{pagecommand={\thispagestyle{plain}}}
You just need to make sure the submissions won't come with their own page numbering, as it would give a confusing result. Even in that case, there would be solutions, but they are more complicated and "hacky".
About the table of contents, the current version of the package supports an experimental option for that purpose. Have a look at the doc (here, bottom of page 6) for the full syntax, but a MWE for your usecase could be:
\includepdf[addtotoc={\thepage, section, 1, Title of the first submission, lbl:sub1}]{submission1.pdf}
pdfpagespackage can do all that. It has (experimental) features for a table of contents, and page numbering can be obtained using theplainpagestyle. All you have to do then is to ensure that the "given Latex template" disables page numbering. – T. Verron Jul 21 '13 at 22:00LaTeXsource for the contributions, consider thecombinepackage - see http://tex.stackexchange.com/questions/119415/trying-to-create-simple-template-for-novice-users/119873#119873 – Ethan Bolker Jul 22 '13 at 00:14