When your saving throws and thaco are reduced is this good or bad?

im pretty new to d&d rules can someone explane me this process so that i can understand?... thx alot for the help

thaco means = To Hit Armor Class 0
There is a thousand people that can better explain than I this but I will try, because I like to help as much as possible.
The lower your number of thaco is, the better...
-5 is better than 0
5 is worse than 0
You can always read this stuff in your manual...

Having your THACO reduced is good!.
Your THACO is used when determining wether you hit your opponent or not.
Ex: You have a THACO of 12 and you are attacking an opponent with an
AC (Amour class) Of 6. What you do is, you subtract The AC of your opponent
from your own THACO.
This leaves you with a "to hit" number of 6.
Now its time for the attack roll.
this is made with 1d20, resulting of course in a number between 1 and 20.
If you roll 6 (to hit) or more you hit the bloody thing
and if not you just look stupid!
This of course is only the short version(there are only about 1000 other
factors that determin the outcome of a batle) but you get the idea
Hve fun

Yes to both. It means that is the number on a 20 sided die that you have to roll. So the lower the number the better chance of getting the save.

Zeber