IT400DRider

Im new to riding and i just bought me a 1977 IT 400D for $150 Pretty good size dirt bike but not a beginners bike. i haven't really drove it yet its kinda ehh intimidating? haha it needs a tad bit of work but it does run real good any tips for a new rider? and if wanted i will post pics of it once i do takes pics of the bike. Also is this bike rare? i can't seem to find any info on it anywhere. thanks again.