When hanging floor joists, use joist hangers to make building a floor deck simpler. Place hangers every 16 inches on center. Position each hanger using the tab to hold it in place. Nail one side on at a time. Use a scrap of two-by as a nailing guide for the other side. If possible, nail them to your ledger board in advance. Now properly secure the ledger boards onto your walls. Set each floor joist into place and secure them with nails. Always check with your local building inspector.
For more on framing, consider:
Quick Tip: Using Metal Studs
How To: Identify a Bearing Wall
Engineered Wood Floor Joist System (VIDEO)