If you are working with the goetia, it is bet to stick with the sysytem as laid out until you know what you are doing, can identify the specifics and create your own system.
The best rendition of the goetia out there is Stephen Skinners "The Goetia of Dr Rudd" coming in at a close second is Poke Runyon's book of Solomon's magic.
I must also state if you o not have the basics of magic, and I am talking ritual magic, down you will get either no result, or pityful results. The other danger is calling up something you simply can't get rid of.
You need to be able to go into trance, to be able to receive visions via scrying. Be comfortable with banishing and invocation, not merely evocation.
You need a circle which is inscribed divine names important to you, or used from the goetia which you understand. You need a triangle in which the spirit can manifest. The circle should be 9ft in diameter, the triangle 3ft each side.
In the triangle should be a scrying medium, prefarably a black mirror flanked by two candles and incense going over the face. But incense will be sufficient, incense produced by herbs (sacred to the spirit) and burnt on charcoal would be sufficient.
There are many things you need. Another thing people never seem to realise is that you need to be invoking the help of the shem angel corresponding to the spirit. People who do not realise that are using the Mathers/Crowley translation of the goetia which is outdated and incorrect.
In short, you need to research, you need to read. You need to make sure you know what you are doing. It is my opinion that you do not- and so you are not ready for evocation. It is fair enough if you wish to ask specific questions, but to ask for a whole technique shows you have not done enough research. This type of magic isn't for beginners, people need to learn to walk before they can run.