You'll do fine. Get a joke book full of corny old jokes,and try your luck with them.
Or you could do quotes from various people. One day, Churchill, the next, Groucho, and so on.
These will help you in developing your skill level as a meme maker. Even if you write professionally, it's a good exercise.
Also, check the imgflip community posts. There's a lot of good advice there.
Most important, have fun.
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