Just start writing. That's the most important thing.
Your style will improve the more you write.
Put pen to paper.
But what should you write about?
Write about anything:
Your morning routine. Do you always get up on the same side of the bed? Do you have to hit the snooze exactly 3 times every morning?
What's your favorite movie? Why?
Favorite T.V. Show. Ed? Simpsons? ER? Emeril? 24 (Everyone in my family thinks this is the best show ever made)?
Bands you have seen in concert. Weird Al? Kenny G? Ozzy? MC Hammer?
Your favorite ice cream flavor.
Your first car. For me, it was a VW Bug. Rust and primer. But the babes loved it.
About your kids.
Inspirations.
How you met your husband.
Talents. Do you play piano? Can you paint? Whistle really well?
Just start writing. Things will fall into place.
Sadly, a lot of folks don't write because they're embarrassed by their perceived lack of writing skills. They're afraid of the rules.
Rules help us understand each other. However, rules are meant to be bent, right? Besides, you have all of the skills that you need to get started.
Write as you speak. People often tell me that I write like I speak. This is a good thing because my personality can shine through.
Is spelling not your forte? I used to be a great speller. The word processor has broken me of that habit. I rely on the spell checker to keep me straight.
At first, you're just writing for you. Don't pretend like someone is reading over your shoulder. You will feel inhibited and insecure. Don't do it.
Most writers, even the gifted ones, right crummy first drafts. Don't be afraid to write poorly at first.
If you're planning on writing only one draft, who cares. Be you. Put yourself into it. Readers will forgive spelling and grammatical mistakes if they can sense honesty and personality in the writing. This is especially true in an autobiography or other personal writing.
Writer's block? Make a list. Like the one above. Your writing block will soon be gone.