Question about license / How could I use the codes?

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Hi, Feel-ix-343, if I make another language server based on markdown-oxide, and I want to make it open source too, what should I do / am I allowed to do so that I won't violate the license (or maybe your wish)? For example:

• Could I change the license for my own project? What license can I use, those stricter than Apache-2.0 or any licenses I prefer?
• In what way should I "carry prominent notices" stating that I changed the files, put a comment on the beginning of every file or ...? Since there are files I just do copy and paste, files in which I change several lines of code, and files I rewrite, how should I add copyright notice to them?

(License terms are really getting me confused :( )

Thanks for creating and sharing markdown-oxide XD