Hi LadyLynn. Welcome back.
Best suggestion for a platinum member is to jump straight into the weekly Writing Challenge. It is the best way to hone your skills and get feedback (and encouragement).
If you have a novel in the works, then make sure you give the Page Turner contest a go this year. You have until October to get a first chapter and synopsis ready. If you are more a non-fiction writer, then there'll be a Page Turner contest for you next year.
Read the archive of weekly articles available for Platinum members. So much good information in there.
Those are just three things to get you started, and the Challenge is an absolute must.