On the timber you are using as your wall-plate, measure and mark out the length of a bearer. Then use the circular saw to cut the wall-plate to size.
At one end of the wall-plate, you'll need to make a check-out so it will sit flush on top of the brickwork. Use the carpenters square to mark out a recess, then use the circular saw, handsaw and chisel to make the cut.
Line up the wall-plate with the lines marked on the wall from your profile piece of timber. Use the nail gun to temporarily attach the wall-plate to the wall. Then use the cordless drill and batten screws to firmly secure the wall-plate to the wall.
Using the wall as a guide to keep the first joist straight, use the nail gun to secure the first joist at the end of the bearer near the wall.
Hammer a nail in at the end of the first joist and another to the wall-plate. Run a string line between these two nails. This will make sure the joist is straight when you attach it. Secure the joist into every bearer, on both sides of the joist where possible.
Use the first joist as your guide and measure and mark on the bearer the required distance to where the next joist will go. Mark every bearer so your second joist will be lined up with the first joist.
Use the nail gun to secure the second joist on each bearer, on both sides of the joist.
Now you're ready to secure all the joists to the bearers. To do this, just repeat the previous steps and work your way along the bearers.
When you've finished attaching the joists, measure the distance between them. Then cut pieces of timber to this length to fit between every second joist. This will provide your decking with extra support. Use the nail gun to secure the timber between every second joist. Your deck is now ready to be laid.