We will host a vote at the end of the year and current leadership will also voice their opinions on possible new leadership positions.
Use the USACO Guide for a full tutorial, it's very in depth and has a lot of good information. You can also participate in other computer science competitions to get a better idea of how to answer questions.
The national competition is a national competition, so it is nation wide. According to the divisions, there is bronze, silver, and gold with gold being the highest honor. ACSL Senior Division Gold is about the same prestige as USACO Gold.
Internships are largely connections based, especially for high schoolers. However, there are plenty of summer programs for research internships for high schoolers. Please see the Other Resources page for more