One day this will be me

bir gün beni bu olacak

thanks in advance

Bir gün ben böyle olacağım.

Yep. But literally: Bir gün bu ben olacağım.

Thank you both of you. Can I just ask that although mine was obviously wrong, was it understandable? 

thanks once again

no.

Dont rush and be patient. It is a hard job to form a sentence in Turkish for a beginner. Too many suffixes to put