There are a lot of sites online where you can find charts of rules and also examples to help guide you. Homeschooling sites are great places to find all the rules for writing. They usually even have the rules all lined out for you on handy-dandy charts that you can download and save for free.
Follow this link to download several punctuation help charts http://www.lousywriter.com/free-visual-charts.php. This is just one of many sites.
I homeschool my children and when it came to teaching my son the importance of the comma, I used this little graphic I found online.
This may be silly, but it is truthful when it comes to our writing. Punctuation is very important and should not be overlooked thinking no one will notice or that it won’t make any difference to your story. It could make all the difference in the world.
If you are unsure of yourself and punctuation, find someone who can help you. Do you know an English teacher? Do you know a grammar Nazi that corrects everyone’s posts on Facebook? Do you know a fellow writer? Those are the people you want to ask for help if you need it.
Just don’t ignore your punctuation problems.