Hello money_killer,
It is very important that your Movies and TV Shows are correctly named and located in a proper directory structure.
Basically you have a Source Directory and all the movie directories in that. For example...
f:\Movies\Four Brothers (2005)\Four Brothers (2005).mkv
f:\Movies\Grease (1978)\Grease.mkv
The directory \Movies\ is the source you would enter for Kodi when setting up Movies. See here...
http://kodi.wiki/view/Naming_video_files
It is also important that each movie has its own directory as you can see above.
g:\TV Shows\Angel\Angel S01E01\Angel S01E01.mkv
g:\TV Shows\Angel\Angel S01E02\Angel S01E02.mkv
The directory \TV Shows\ is the source you would enter for Kodi when setting up TV Shows. Again it is also important your Episodes have their own directory, otherwise if you create your own nfo files and artwork, then that TV Show folder is going to get real messy real quick.
For the naming of movies and TV Shows, it is very important that the names match exactly as they are listed at the scraper site. The default scrapers are TMDB for movies and TVDB for TV Shows. As for IMDB, they don't allow scraping on their site, but there are scrapers available. You just need to locate and install. I think Universal Scraper does it.
If you like, copy and paste your movie and tv show titles that are not scraping here. Maybe we can point out why it is not working.