How can I best prepare for Ramadan?

I’ve taken up the plan to mimic ramadan for 20 days. I’ve already fasted in the past but I’d like to do it different this time. Because it is the first time I’d be doing it I’ll only keep it up for 20 days (also because I’m the only one in my surroundings that does it) but I still suppose it’ll be quite difficult, so I was hoping on some good advice. Thanks in advance :)