All you have to do is write like five sentences to your future self??? That doesn't even require brainpower my dude.
"Hey future me! Hope you're doing well. I wonder what I'm like? Maybe I have a cool job. Maybe I won the lottery!!! I just want you to know that if times are hard, you're gonna get through it because you are a tough cookie. YES YOU!
get a journal and pencil and when you go to sleep, don't put on any alarms. then write down in the morning what you dreamt about. every detail you can thing of. if you have the dream again, write down more details. this will help you begin to lucid dream.