Trying to create a "Hot or Not" type page - need some guidance please

I'm looking to create a node similar to Hot or Not, but to be used for cars.

It seems simple enough, but I am a new Drupal user, and am a bit lost. I'll lay out the skeleton of what I think I need to do, and any input or help would be GREATLY appreciated. I just need some guidance, not hand holding through the process.

I assume I will create a content type using imagefield_gallery for the images. I will have data fields such as manufacturer, model, year, and other notes. This should be simple enough to create and have users enter their cars and data.

The tricky part comes to these next two parts.
1) I want an area where a user can view random uploaded cars, and rate them one by one. This could also be filtered by the viewer to show cars in certain categories only, i.e by manufacturer, model, etc. Is there a way to show a random node ?? Am I on the right track?

2) I want these cars a user uploads to be shown on their user profile page. I have done this already using nodeprofile and a host of other node modules, but they can only add one car through that area (even though I put the max at 5).