Create layout e.g. in eagle, then print it with the layers visible (don't forget to use ratsnest):
Settings for printer in eagle:
Print the layout to coated paper, I use here pages from the Reichelt shop.
Use a PCB without photo lack. Clean it with Aceton then place the printed layout on it and use a laminator to fixate it. Now put it into the oven at 150°C for 5 minutes. Fixate it again with the laminator 3-5 times.
Now use warm water with dish liquid and a tooth brush to remove the paper from the PCB do it with care or you will remove the toner from the PCB.
I use Natriumpersulfat. Warm it up to 45°C, place the PCB in it and wait until the coper is gone (take about 5 minutes). Clean the PCB with water. Now use Aceton again to remove the fixated toner.