A mild but not the right dream

Well, today i had my first mild, i did exactly as the tutoral said. I relaxed my body for several minutes, i did the mantra for a couple of minutes and i imagened my dream scene for a few minutes, then i went back to my mantra which was i will notice my dream sign and do reality checks when i dream. And it really worked to.
It took almost an hour for the dream to form and aboiut 2 second into the dream i said out loud, "This must be a dream". So, i did the reality check but i didn't see any dream signs. But here's the problem, the dream that i imagened didn't happend, i dreamed about something complete opposite which i vagely remember, what can i do to dream about the exact thing that i want to dream while i'm milding and imagining the dream scene?
Oh yeah the reality check that i did failed for the first time, i looked at my hands and i had five fingers on each but i still knew it was a dream some how, probably because it was a mild.

When you're in a lucid dream you can change the scene and enviroment so there isn't that much of a need to Try to create a scene before your lucid. You just have to say 'change scene to ....' then hopefully it will change.
Hope this helped.