[OT] Telescopes

Anyone know much about telescopes? I was given a Tasco 66TE one with some
extra eyepieces. I am clueless as to the purpose of the extra eyepieces, and
the long tube with a glass in in about 1/3 of the way up (is this an
extension peice or something else)? Naturally, it didn't come with a manual
and my google-fu for finding it on-line is failing me.

Of course, the weather has been miserable, with either clouds & rain
rendering the telescope useless, or so bitterly cold & windy that there is
*no way* I want to be outside! So far the only thing I"ve seen is the front
door knob of the neighbours over the other side of the road :-)

Still, its one of those things that have been on my 'wish list' forever, and
it was free, so I have absolutely no right to complain - but wish someone
would explain it to me! Anyone know more about telescopes, their operation &
care, please give me a quick tutorial on what I should be doing, please?

Yowie