By downloading the official Twitter app. You'll then receive notifications when someone tweets you. (providing you have an account)
If you protect your updates, the people who follow you CAN see your tweets, but ONLY the people who follow you.
You can tweet about anything, there aren't any "set" tweets that people use.
You will receive tweets on your homepage from everyone you follow. Unfollow them to not receive their tweets. To stop people seeing your tweets (except from those you approve) you can protect your tweets from the settings menu.
You can't. But you can block people or protect your tweets, but if you protect your tweets people can not retweet them.
Yes. You can either send Tweets to other people or even message them.
You can't do this. You either protect your tweets and approve people to follow you or you unprotect your account and your tweets are viewable and anyone can follow you.
People won't be able to use the Retweet function on your tweets if your tweets are protected. This doesn't stop them copying and pasting your tweet and retweeting the old way though.
You can protect your tweets so that you must accept people to view your profile and tweets.
msn is a messenger well was, now it is joined with Skype. But on msn you added people, talked to them, made statuses, and you could video and microphone chat them. On twitter you can direct message people make tweets (kind of like mini statues), retweet and favorite other peoples tweets, reply to peoples tweets, follow people, gain followers, and more.
If your account is private then only people that are following you can see your tweets. It doesn't matter who you are following, they must be following you to view your tweets. So, if you are following someone but they aren't following you then they won't be able to view your tweets.
The timeline has all of the tweets from people that you follow in the order that they were tweeted. The most recent tweets are at the top.
The only way you would receive these tweets is if they are retweets or if you are following them.