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Place your pumpjacks and a single track anywhere.
Create a blueprint with the pumjacks and the track, then, click on Export to string and copy the string into the textbox on the website.
Select all of the options you want, like the position of the train station, radar...
Turrets and walls can be useful if your pumpjacks are far from your base.
Now, you can click on Get Oil Outpost Blueprint. It will give you a string to use in Factorio, copy it.
If you want to save your settings for a other use, you can click on Get Settings URL. It will give you an URL. When you will load it, the website will set all of his settings as you selected them.