Help a beginner

[Gil Ayala]

I’m a beginner user, so I need help to install Marmotta:
1. I actually bought a server service in hostpapa.com
2. I don’t know how to start. 
I mean, I’m reading in the installation guide that I need to install Java SDK 
and Tomcat, so do you know a beginners guide step by step?
Because I don’t even how to install Java in a commercial server.