My content contains a lot of new ideas. Are those ideas protected?

No.

Copyright law protects the work which has been created, i.e., the way you have expressed it. Therefore, if somebody used the same ideas to create their own content, whether before or after you created it, they would have separate copyright over that content since it will be their own expression of the same idea (and as we have already mentioned, there is no copyright in the idea but only in the expression).