Analysing RNA seq data

Hello all!
I am new analysing RNA-seq data. They give me a directory containing: 1 normal sample and 15 tumor samples, each one has its cel file, exp file, and dcl file.
They ask me to do a reanalysis, but I think I need more information, like the plataform (e.g. affimetrix) and the annotation database. Am I correct? How should I proced to do the analysis?
I have followed this tutorial, but I do not have all the data here.
Is there a way to get the probe annotation or is something that they should give me?

Thanks!!

You should get the GPL number