Just took delivery of my first smart phone and am blown away and overwhelmed! Could anyone help me with these questions please?!

1. The pre-installed apps:

Video Unlimited, Music Unlimited, Track ID, Sony Select, Play Store, "Get Apps" these are on my home screens - do i pay for any of these? Are they any good? Or just immediate delete?!

2. Latitude app - on my phone i can see the phones location, is there anyway a user at home can track my phone? ie see my current location?

3. Sony Car, Wisepilot, Navigation - all pre-installed. Any good? Are they free to use?

4. "Let's start PSM" - wth is that?!

5. How do i delete apps? Facebook etc

Thanks to all that help and sorry for been a noob.