Dave Vizard's book can be found here:
It is slightly out of date, but will cover the rudiments of pocket porting, back cutting, throat percentages, and the like.
One of the most important things, I think, is to get some aluminum sheet stock that you can use for making templates so you can make all shapes the same. You want to make some patterns that have a "finger" that you can stick into the valve guide, and cut the template so it conforms to the inside, outside, and long side of the bowls. Make those for the intake and exhaust. Make some more patterns to fit over the outsides of the exhaust ports so you can make the short side floors all the same. Same with the long sides. Same for the port floors and roofs. You want templates for the ski hump on the short side.
If at all possible, try to find a well worked head, and make templates from those.
Write or call one of the flow bench companies and have them send some literature on using their products. Find out what tools you need to start out cheaply.
Dwyer instruments makes a lot of airflow checking tools. Can be found here:
I would see if you could get one of their catalogs and some of their reference manuals.
Some of the gauges you need can be made from plastic aquarium hose and filled with colored water. Some of the measurements you will be making do not need absolute values, only need to tell if airflow is faster or slower in one area of the port.
Some people use a small, like 1/4", Styrofoam ball with a piece of thread through it attached to small wood dowel to see how air is flowing faster or where there is turbulence in the port.
The idea is to just play with all that stuff for a while, and you will see how adding some putty to a spot will change flow, add or remove turbulence. The goal is to get the air to flow through in a straight line without being turbulent.
Next thing is to hang out over on SpeedTalk and look through the archives about head porting. There is a ton of math on that site pertaining to airflow. You must know that to be successful at porting.
Just remember that all the porting is done by human beings. They live and learn, and that is what you must be willing to do. We can all do the same stuff if we are willing to prepare ourselves for the task.