In the contacts listing you can have multiple entries depending on where the contact info has come from. So, for instance, if you've set up Facebook on it then it will be getting contact info from there. It will also have contact info from your old phone. What you need to do is tell the phone a) which contact entries are for the same people, and b) what each kind of phone number is.
Let's say you've got two entries for Jo Bloggs, one from Facebook and one from your old phone. Go into the contact lists and press on one of the Jo Bloggs entries. It doesn't matter which one. Then press the menu button (the one that lights up bottom left) and press "Join Contact". Now choose the other Jo Bloggs entry. It will link the contact information from both of those into a single listing.
If you've got lots and lots of contacts then it can take a bit of time to go through all the entries and link them but once it's done you've got all the information about Jo Bloggs in one place.
If you accidentally join the wrong contacts, choose the contact, press menu and select edit, and then scroll down and press on the "joined contacts" bit. That will then give you a list of all the contacts joined to this one. Press the red minus sign to delete the join.
To change the contact information type (eg, to show "work" or "mobile" or "home" etc) press on a contact, press the menu button, and press edit. Under the bit where the phone number(s) are listed you'll notice that the box to the left of the actual number (probably saying something like Work or whatever the default is) is grey. You can press on that grey button and choose "mobile" or "fax" or whatever. You can add additional phone numbers by pressing the green plus sign to the right of where it says Phone. You can do the same kind of thing for email addresses, too, so you can distinguish between a friend's personal and work email accounts.
Finally, the icons on the top left of the screen are notifications. They're there to tell you that something's happened that you might be interested in - the battery's fully charged, or you've got an email, or there's an update for one of your apps etc. Press on those icons and then drag your finger all the way down the screen. You should be able to pull down the notification area at which point you'll see a screen saying Wi-Fi, Bluetooth, GPS etc across the top and then a list of Notifications. You can turn the Wi-Fi, Bluetooth etc on and off from here as well as pressing on any of the notifications to get more information. Or, if you just want to clear all the current Notifications, press the Clear button (on the right, underneath the Auto Rotation icon).
Hope this helps.