I will prepare for my contest like this way.
First, I will sing the song for my contest.
Second , I will practice dancing for my contest.
Third, I will memorize the song and dance that I will perform. These are the ways how I will prepare for my contest.
REMINDERS:
1. Let's not forget to use possessive noun "my" in a sentence to emphasize that you'll be part of the contest.
2. It is not happening yet. Let's use "Future tense."