There is absolutely always more to learn, but I would like to share what I have learned so far about ambient tones. I've been playing and experimenting with electric guitar fx and tones since I was about 13 years old, and this is where I am now.
If you are a new guitarist who is interested in FX, this is a quick run down on how I do things. Again, I am not a perfect guitarist, and tone and FX are merely subjective. Although, I hope this is informative and helpful in gaining an ambient wash with your rig.