Personal suggestion - after working on my own games for quite some time, I strongly recommend that you start small. It always seems easy at first, but then you begin to realize the sheer amount of detail that needs to go into it if you want many people to play it.
"In the House of Temptation," my short text game, took a LONG time to build, organize, frame, and detail. And that game can be completed in about five minutes. My next game is going to be even more complicated, because I'm switching engines and have to learn how to use this one. Even with less Sex (which, oddly enough, was the hardest stuff to write), I'm going to have more to detail and describe.
The sheer amount of detail that will go into it all is likely more significant than you realize. So, if I were you, I'd cut down on certain plot lines and make a clear, concise, and short story. If game-making is something you end up enjoying, then you can always add more later - whether it's more content in the original, or an entire sequel!
Of course, if you've made such games before, please disregard ALL of that.
Regardless, I look forward to seeing what you create! On a personal level, I hope it has some sexy Succubi involved!