If you jailbroke it by using cydia all the apps and cydia apps will get deleted
Technically yes because it will remove your jailbreak if you update and any cydia apps, such as installous will be deleted.
download blackra1n here: http://blackra1n.com/ and follow the instructions. after jailbreaking your device start blackra1n and install cydia (or rock, its better and faster!) When you go onto Cydia the first few times, it will do some downloading and then go back to the homepage, but after that, Cydia is fine. Also, Cydia says it needs an update on one of the first few times. It is very important you update or download these updates or Cydia may crash.
Cydia has nothing to do with the app store. It is run by a someone else. You may not verify your apple id with Cydia. It is just not possible.
No
you have to go to cydia and just go to manage then go to source and it should be there.
No. Edit: If you mean pirated apps, no, just transfer your purchases to iTunes If you mean apps downloaded off cydia, yes they will be deleted.
you go on a website called jailbreakmatrix
Yes, you can get Cydia app downloaded over your Android device from the PlayStore.
Well the no matter what you do. Update, Restore, and etc, you have to rejailbreak it.
You can't. It's impossible unless somehow apple let's it into the app store.
No. Cydia tweaks is fully updated for the ios 7 for apple.