I would like to earn a little money for realizing a good, simple project.

My idea is to build a website for learning of chosen by me language (for users knowing English) using mnemonics.
Users would be encourage to enter English words with translation to another language and describing the way, how to remember a foreign language word (an association link).

Example:
if I choose learning Spanish for people who knows English well, it would look like that:
every user would be encourage to enter a way to remember a chosen by him/her Spanish word.
So he/she would enter to the dictionary (my site database) ,e.g., English word: beach - playa (Spanish word).
Then he/she would describe the method to remember Spanish word, e.g.,
"Image that U r on the beach and U play volleyball" -> we have the word play and recall playa (mnemonics).

I would like to give possibility of pic hotlinks, encourage for fun or little shocking memory links which is -- in the art of memory -- good. I would choose a language to take a niche of Google Search.
The big question is if I don't lose my time on it?? (Maybe I need to find prototype way to check that idea?)