if dvd catalyst is 10$ and best on market, seems like it would be better than winx (its 50$)

i bought / downloaded rip tide but it goes to the 'tap to start' screen and gets stuck there

hello everyone
i joined this forum to find out information about the nexus 7.  i just got 1 to look at and thinking about getting 1 for each kid but evaluating this one now.  I can not get past the select network page so am concerned that I can not work offline or if u just have to have a network to connect to the first time.  I also want to know about the cloud.  doesnt seem like there is much space on the device itself and wondering if I can upload any/all music mp3s, itunes format, etc.
and if i can upload movies.
also wondering if i can download apps when connected to my laptop computer.  it says no devices though but i can see the nexus 7 in explorer and its folders.
im not really sure where to find the answers to these things and not the most technilogically fluent.

any help would help
thanks in advance