Hey
OKay so I couldn’t remember my dreams ever, but then i did what u suggested and started a diary. since then I’ve remembered at least one dream every night. It rocks! But when I dream it’s totally like watching a movie. I figure your suppost to look for signs to realize your dreaming, that would be the next step, but it feels like I wouldn’t even have the chance to see a sign. What would you suggest? 
i’d say just keep at it, and look for dreamsigns anyway. as you keep your diary you should notice your recall and the clarity of your dreams getting clearer over time.
another reason they could be unclear is because you aren’t waking up directly from the dream… this could cause them to be more like a movie. experiment with setting your alarm at different times in the middle of the night… where you get up and write your dream down, then go back to sleep. an alternative to the alarm would be drinking lots of fluids before bed, that will get you up at different times… and most likely you’ll remember some dreams.
good luck with this, just keep up with it 
I write in a dream journal too. A method that I use with wake-back to bed is reading some of my previous dreams for ten minutes then go back to bed saying in your head, “One I’m dreaming, two I’m dreaming, three I’m dreaming,” and so forth. Since I’ve started this I’ve had a few WILDS per night.