mostly,
when you're at this page:
http://www.nationalesl.com/us/sc2/
click on the 1v1 tab. that will show the schedule for each cup. Furthermore, once you have clicked the cup you would like to enter, you can then click on the lower tabs for tournament tree, sign up, rules. That's the process i believe.
The Open Cup is for everyone, and is mostly for fun; the Division Cup has limited spots (64), so you need to sign up fast.
You probably want to go for the Division Cups. The top finishers of each of those division cups will be qualified for the more prestigeous league tournaments
<SyrianRue> are division cups open to everyone?
<ESL|Beef> yep
<ESL|Beef> they are limited to 64 people but we will expand it with enough signups
<SyrianRue> so what's the difference between open and division cup?
<ESL|Beef> open cup is open to everyone and is for fun
<ESL|Beef> the division cup is open to everyone but has limited spots and the top finishers will qualfiy for our top divisions in our SC2 league
ima make you famous! lol anyway, let us know if you decide to enter. it'll be fun of us to watch you on live stream with commentators.
for further info, log on to IRC's
gamesurge server
channel: #esl.sc2
*lots of admins and moderators in there to assist you if you have further inquries.