Save them, and then put them in a folder--> right click "Add archive" As for adding them to dA, ask 4nub1s or another dAer..not to sure. BFTP
save them as a pack and make a preview with you brushes. when your on DA, click on submit and follow the steps, brushes go in the category: "rescources" with the subcategory: "photoshop brushes: just think up a name follow the steps and click on submit.
Upload the .abr to DA, not a .zip, because it makes it alot easier to upload it into photoshop. To make a pack, simply open all your brushes, and then save the brushes as a single pack.