Mac Developer Program members who plan to distribute their apps on the Mac App Store can now log in to iTunes Connect and create their account. This suite of web-based tools allows developers to submit and manage their apps, check the status of contracts, set up tax and banking information, and obtain reporting on sales and downloads.
Mac Developer Program members who are also enrolled in the iOS Developer Program can use their existing iTunes Connect account and do not need to create a new account to submit Mac apps. However, all developers who are submitting paid apps for the Mac App Store will need to click through the Paid Applications Agreement in iTunes Connect.
The App Store Resource Center offers a wealth of information to assist Mac developers prepare their apps for submission to the Mac App Store. You'll find details on setting up an iTunes Connect account, the metadata you'll need to submit along with your app, assigning keywords, what to expect during the review of your app, and managing updates to your app once it's on the App Store.