Welcome to our forum.
If there can be an ideal way to be introduced to polyamory, you seem to have found it. Congrats; L sounds like a wonderful guy. It also sounds like you have an exemplary attitude and outlook going into this, and will be able to try the lovestyle realistically.
Hope you enjoy reading and posting on our site; there's certainly a lot to learn here, and many friends to make.
With well regards,
Love means never having to say, "Put down that meat cleaver!"