Anyone willing to Help?

Hello I am a noob to the jailbreaking of ps3 and I have many questions.
Feel free to answer and give advice to the questions you know. THANKS!

1. Which is the best to jailbreak E3 Card Reader OR X3Max???

2. I have a fat ps3 3.50, - Is there a way to downgrade WITHOUT losing BLUERAY or any other features?

3. can i play online with backup games?

4. is it possible to download games and play them on external hard drive?(not saying that i am just asking is it possible)

5. is this safe, anything bad come out of jailbreaking? Cons and Pros?
6. any other information i need to know?


thanks for taking your time to answer