IPhone 3GS Jailbroke

Now before we begin I just want to say I'm a complete newbie to Jailbroken iphone's. I only got it today and I it's a iPhone 3GS. I have a few questions. If you don't mind answering them, I would greatly appreciate the help.

1. What is a Jailbroken iPhone?

2. What is this new app I have called Cyria?

3. I heard I can get Apps for free even if you have to pay. How do I get them?

4. What shouldn't I download?

5. If I plug my iPhone 3GS into my computer and sync everything, will the Jailbreak be undone?

6. How do I be really careful in what I'm downloading?

7. On Cyria, it says I have 5 changes and a message comes up say '5 Essential Upgrades, One or more essential packages are currently out of date. If these upgrades are not performed you are likely to encounter errors.
Upgrade Essential
Complete Upgrade
Ignore (Temporary)
What should I do, I'm scared I will mess everything up.

8. Can I still use the Apple App Store?

9.Am I charged anything when using Cyria?

10. If I sign in using Google or Facebook do I have to pay?

11. Can I still charge my iPhone 3GS?

12. I heard there was a New Law which said jailbreaking iPhone is now illegal except for 'legacy phones' these include iPhone, iPhone 3G and iPhone 3GS. When jailbreaking one of them, it is completely LEGAL to do as long as it is one of them phones. Is this true?

I'm 13 Years Old and I'm new to all of this. Please help me and no rude comments, Thank you.

P.S. Sorry if this is so long!

1. Jailbroken means that you are no longer restricted to Apple's restrictions. You can install off-market apps from Cydia and apply tweaks.

2. Cydia is where you get your jailbroken tweaks and apps from.

3. You can get them by installing apps such as app cake, share, and ipastore.

4. Stay away from tweaks that you don't know about. Some of them can really screw you up.

5.No

6. Don't download anything without reading the description.

7. Upgrade it.

8. Yes

9. There are payed apps, and there are free apps. Stick to the free ones or get a repo.

10. Don't sign in on Cydia unless you want to.

11.yes

12.It's legal for all iphones.

you keep saying cyria. It actually cydia.