I've moved this to the Copyright and Legal discussions forum. ^_^
Search for the songs through YouTube's Music Policies database () to get a better idea about what happens if Content ID flags your video. Make sure to search for each song used. It will tell you if the video will be blocked by other countries, and whether or not you can monetize it for shared revenue. ^^
If it does not appear in the database, then the copyright owner can manually take down your video and give you a strike if they want. Also, the current music policies are always subject to change based on YouTube's negotiations with record labels, which is why a lot of YouTuber's are apprehensive about using Copyrighted music in their videos.
Yet it's totally okay for people to post full length movies on their channel and never get a single strike :/ That really sucks they let people get away with that and then punish people who actually go to the trouble to get permission to use stuff.
Thank you very much for your help