I had this same problem a while ago. I was used to finding clues just by searching or visiting the crime scene in Shades of Mystery, without the need to have skills (eg. footprint analysis) to be able to find them. I just recently tried playing Noir.
Well, I just tried the *2WE + fake alibi = guilty* formula, I have read somewhere in the Newbie FAQs. And -- thank God -- it worked.
It took me about an hour or two to ACTUALLY know the basics and get, atleast, a bird's eyeview of the game, though. I went on asking some random online guy if he could help me, and yes, he was happy to do so. I also tried the forums and FAQs & help guides.
Well, it was all worth it after all. I solved my first case! :)