This is one of the reasons why all my lenses (except the 50mm which has a deep recessed lens) did not go 45 seconds after me opening the box for the first time before a UV filter was placed on them.
If you scratch your UV filter, its $15 to replace. If you scratch a lens... well pretty much there goes that lens.
Another hint is to use a microfiber and cleaning solution from any optimitrist. I bought this little kit of a microfibre clothe and cleaning solution from my sister's optomitrist for $1.99... I look at
Adorama's website a while back and saw the SAME thing there, but with a Nikon emblem for (and I kid you not...) FIVE times more.
You can find deals in some of the strangest places at times.
You do not need a Giotto rocket blower unless you have multiple lenses and/or have bad lens changing technique. But eventually your camera will need a cleaning and that would be the time to get the sensor cleaned, if needed.
Yes, having a lens cap on ALL the time when you are not using the lens is also a given. Heck I even managed to take a picture with the lens cap on once or twice! (lol)