I am a newbie to this language so I don't know where to start. I am ready to take a lot of effort and would really like to know how to master this language. How can I get started with learning Latin?
I'd suggest a bit of background reading before you take the plunge. 'A Natural History of Latin' by Tore Jansen would be a good place to start: it is an excellent survey of Latin and its history, demonstrating very gently how to approach it while introducing the accidence and syntax in a general, but very positive, way. If nothing else gives you an appetite for Latin, this certainly will.
Good luck. Latin repays all the effort you can put into it!