Forum:Summoning questions I must learn

Okay I'm still kind of new at this, and every single time I look up these questions elsewhere they completely contradict themselves one way or another. I have to know!

When you special summon a monster, can you IMEDIATELY tribute it? Example; I special summon Changer Synchron from the graveyard and in this same instant/turn use him to synchro summon a monster and attack with that synchro summoned monster. As soon as he is special summoned he goes right back in the graveyard being used for the synchro. Can I do it?

And someone told me that I can attack with a monster, and then tribute it the same turn, which to me sounds like b.s. Is this true?

Someone who knows what they're talking about help me out here! Its much appreciated ^.^

Thy name is Church btw and I'm completely new to this whole forum XD

Thanks guys