2. With step 1, you can get a Business Checking account (some banks have free, I've used chase)
3. Get an account on freshbooks for your billing (invoicing, bookkeeping, accounting -- it will help when taxes comes around and in general to keep track of the financial health of your company)
I highly recommend you do freelance with your LLC in case you start signing contracts and there is a dispute, they'll go after the LLC, not after your personal assets.
Some things can be logged as business expenses, and some as personal expenses, just use common sense, and do talk to an accountant when you have to file taxes. The LLC itself does not pay taxes, you pay the taxes as income when the money goes from your LLC to you.
About explains it better:
"The tax implications of an LLC differ from those of corporations. LLCs use "pass-through taxation," which means the LLC does not pay taxes. Income from the business is instead passed down to the company's owners, who are called members in LLCs. They claim the profits or losses on their personal tax forms." http://sbinformation.about.com/od/ownership1/a/llctax.htm
IANAL