Here are some links to places that have helped me immensely in my writing. I would consider these to be completely indispensable to any new writers.
Mary Soon Lee – has everything from proper formatting to links to sites with sales leads.
William Shunn’s Manuscript Format – the best reference for how to format your work.
Duotrope – a website that lists markets, complete with a submissions tracker!
Thesaurus.com – when you can’t find that word you’re looking for.
Google Docs – a great way to back up your stories, accessible just about everywhere!
The Business Side:
Simple Record Keeping and Tax Deductions for Writers – “Writing is a Business.” Learn how to save some money come tax time to support your work.
Tax Aspects of Authors/Writers/Screenwriters – A bit more detailed information on what you can and can’t write off and how to treat your writing as a second profession and not a hobby.
Freelance Writers Tax Tips – A great guide to what you can deduct and how to do it.