I am extremely knew to using this. Never done any coding outside of batch, and couldn’t figure out how to use eclipse after the tutorials I used became out of date. I can pick up quickly from video or live instruction. I have 0 knowledge of Unity.
Start with learning the Editor, this will instill the ability to quickly iterate through your scenes and objects and make modifications, the concepts are important.
Second, hit up the beginning scripting tutorials, decide if you fancy UnityScript(javascript type syntax) or C#, boo is also a consideration, but they may remove it in the future and less information is available.
After that, hit up the tutorials that interest you, check out the projects that Unity offers for free.