There are lots of helpful scientists out there who are willing to answer questions about space. Who knows, maybe they've even already answered your question. Here's a list of places to get answers:
http://spacescience.nasa.gov/questions/index.htm

Several NASA centers offer jobs to students. More information is available at: http://www.nasajobs.nasa.gov/

NASA's Student Involvement Program is a great way to match your wits, or your entire class, against students from around the nation. There are prizes, too.

NASA's Planetary Photojournal is home to thousands of images of planets, moons and other bodies in our solar system.

Study hard. More information about astronaut selection and training can be found at: http://spaceflight.nasa.gov/shuttle/reference/factsheets/asseltrn.html

NASA no longer allows cars to drive onto Kennedy Space Center to view launches, but there are options. Find out more at: http://www-pao.ksc.nasa.gov/kscpao/carpass/carpass.htm

Yes. This link gives you all the information you'll need: http://www.nasa.gov/ntv/