VAG COM question

OK I'm a newbie when it comes to the vag com stuff, as I've never needed it and not really read up on it, so I have a few questions...

What is the difference between OBD 1 and 2? What cars used which?
Can I download the software to my computer, then just buy a lead?
What would I need to plug it into my 1995 skoda felicia?
Does it only read fault codes or can you reset service lights, turn off airbag lights etc.?
Can you re-map ECU's with it?

Not sure on how you use it but i know you need to buy the software which is around 200 quid aswell as a lead, i looked at getting it for the golf and bora but theres a bloke up the road who charges 20 quid for a scan or i can get me old dears bloke to do it.
If its just fault codes you need clearing you can get a little device off ebay that will clear codes which is only about 40quid.
Wouldnt recommend using vag com if you dont no what your doin will knacker important stuff up if you click wrong buttons.

I theory you can't break ought with it. Its only a fault code/live data reader and willl reset lights and delete fault codes. You cannot re-map shiz with it. OBD2 is stock on any euro market car post 2000. OBD1 is pretty early and I never really got involved with it.I'm guessing a 95 Felicia with use oldskool 2pinx2pin VAG diagnostic socket hich you can buy the lead for it to work with vagcom. OBD2 is nearly always 16 pin socket.