The bend in the elements isn't critical, but mainly depends on how fat you want the end of each cone. The fatter the cone, the wider the bandwidth, however you will trade some gain for bandwidth when you do this. I suggest experimenting a bit. Generally, though, having the horizontal part of the element a little less than half as long as the vertical part of each element should work well. One thing that is important is to make sure all elements are the same length & shape. Cut & bend the first element, then use it as a guide to bend the rest of the elements.
To connect the elements to the mast, I drilled holes for the wires and then fixed them to the mast with epoxy. The antenna is fed in the center like a normal dipole, either using a connecter such as a female BNC, SO-239, or connecting the cable directly to the elements. It should be noted that the elements for each side of the dipole must all be connected together at the feedpoint. The far end does not need to be connected. Even though I showed the coax connections one way in the diagram below, it does not matter which side of the coax is connected to the upper or lower side of the antenna.
A pic of this antenna in action can be seen here.
In 2003 I took this antenna down after a couple years of service and found that the weather had deteriorated the antenna to the point that it wasn't worth fixing. Even though I had used several coats of paint on the wooden broom handle, it still rotted & warped from the sun, rain, and ice. If I rebuild this antenna I will definitely use a fiberglass or PVC mast. I wouldn't recommend using a wooden mast unless it was very well treated against weathering. PVC or fiberglass will stand up to the weather much better.