Good morning. I have attached the sketch that I promised. It is not to scale, but it shows the relative placement of all the parts. Click on the link below (If you have trouble with the link please let me know):
The parts should either be pressure treated or Western Red Cedar for rot resistance. Fasteners should be deck screws (not drywall screws... so they do not rust). Pre drill holes for all screws (about the diameter of the screw) through the first member to be fastened and let the screw self tap through the second piece of wood.
Begin with the holes in the ground, then...
Place the posts and plumb them. You do not have to mix concrete with water. The moisture from the soil and rain will set it. Make sure the posts are long enough for the height of the handrail that you want.
Next, install the handrails from post t post on the porch side of the posts.
Next install the bottom bands.
Then install the balusters. Balusters should be installed plumb.
If you give this some thought at every step and place the parts temporarily until you are sure you have it correct, you should be able to do this well. Remember, I sketched this the way that it should be assembled (general placement of posts, balusters, locations. and joints)
Give it plenty of thought before you begin.
I am ready to be rated, but if you have questions, I will continue.