The first time cyclocross race

[liflawless]

our city will have a cyclocross race in next month,i also take part in this project.I have not a regular race bicycle.Generally speaking,most of participant will choose assemble their bicycle by themselves.Let me puzzled that this is the first time i take part in as like race,i don’t know which parts of bicycle suit me.I found a bicycle site,but i think there is a certain risk about online shopping in this site,so i want to know have anyone heard of this site?
[http://www.carbonrimssale.com/carbon-wheels-clincher-38mm-depth-in-23mm-width.html ]
[http://www.carbonrimssale.com/29-mtb-30mm-wide-carbon-wheels-clincher-20mm-with-novatec-hubs-d881sb-d882sb.html ]