attempting to make a map extension.

Hey all, so im basically walking into the ark dev kit with my eyes closed, ive been attempting to make a map extension (or well to start the process to make it anyway) but i cant seem to find any kind of infomation that someone who has no experience with the dev kit(like myself currently) would find useful to start this little project of mine. can anyone help with that? i have the The Center level loaded in the dev kit (which is what i assume is the first step) if thats any help

Watch tutorials. All of them.