First off, welcome and good job on the lucid.

A great dream sign is something that is kind of normal. That way, everytime you see it in real life, you will RC. Hopefully, this will carry over to your dreams. Sometimes we ignore certain things, I suggest you keep a Dream Journal online here, and after a while, ask others to read through it and see if they notice anything that happens often.

As for recall, go here. For DILDs, go here.