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[WH40K] Some general questions from a heretic/newbie

So I've just started with WH40K, and I have got some questions that plague me. Just general questions.
Please correct me, if I got some facts wrong

1. The warp: Do I understand it correctly, that it just appeared, when there were many humans in the universe? Psykers get their powers from it, don't they? 

2. Daemon/Warp Invasions: they can't be stopped, just held off, can they? You just have to defeat the warp creatures to stop this incursion?

3. The Emperor: He is a very powerful Psyker, who got wounded by horus that badly, that He needed the golden throne, which is an ancient artifact, to survive. The GT even further amplifies his psychic abilities and He weakens the Warp Invasions, Daemons etc. 

4. The end of all this: The incursions couldn't be stopped completely, only if He were to defeat the Chaos Gods?

Did I understand all this correctly? 
Thanks in advance and sorry for this bulk of questions.
gpt
1. Warp was originally were all souls rest, but the War in Heaven 60 million years ago fucked it so bad it became Chaos as we know it. Now any time a massive amount of emotions flood it it can result in a new Chaos God. All psykers draw from it, but are constantly at risk.

2. Yeah pretty much, once something like an Eye of Terror opens up your kinda boned. Smaller rifts might be able to be fixed though copius amounts of fire.

3. The Emperor is a fusion of thousands of human shamans, the old school psykers. He was their giant middle finger to Chaos trying to eat their souls. The throne doesn't do shit to close holes, it was part of a bigger project to avoid the Warp

4. He was a problem, but even he couldn't take on Chaos Gods alone. He was just trying to find loopholes to avoid them like the Web Way, which was what the Golden Throne plan was trying to do.