EXAMPLE: I've chosen to write a sonnet as a Mother’s Day gift.
Think instead about who's going to read it and what effect you want it to have on them.
Your teacher may appreciate it if you choose an unusual topic.
After the first line, depending on the type of sonnet you're writing, you already know at least one of your rhyme sounds, so you can plan ahead a little.
If you're having trouble "thinking in iambic pentameter," it may help to memorize a sonnet (this is easier than it might sound).
Once you've got your sonnet memorized, you may want to imagine the author looking over your shoulder and offering encouragement.
Forget for just a moment about how to write the sonnet.
Start by deciding the purpose the sonnet must serve and the audience it’s intended for.
So is "I'll never understand this algebra" (more or less--but who knows what you'll rhyme with "algebra"; better to go with "I'll never understand geometry.").
But your poem can be about anything at all; just keep in mind the pattern of alternating unstressed and stressed syllables.