TWITTER HELP! REALLY CONFUSED!?

[Hannah]

Sorry about the capitals but i am really confused! Well i have a twitter account and i dont know how to use it in the 2012 version.. Well i know how you tweet people you put the '@' sign before the username! Because i really really really want conor maynard to follow me! And i dont know how!! Also I noticed on his tweets if you press 'open' a load of comments come up and i really want to comment as well but theres no comment box? I press reply and reply but then i still dont come up on the comments? I dont understand? Also i want to know how to get more followers? .. If somebody experienced with twitter can comment with a LONG paragraph about how to use it etc i would be SOOOO grateful as i dont understand?
Oh and also i want to know if your ment to get a notification when someone mentions you! I get a notification on my phone but on my laptop am i ment to get a notification like facebook?
Thank you!