#2
normally they are labelled guitar 1 and guitar 2 etc, your better off d/l tuxguitar and powertab as the text tabs are not a good format.
#3
I just downloaded the power tab and the software, and it looks almost the same

If you number each tab section, is it normally rythym are odd numbers (section 1, 3, 5 etc) and lead is even numbers? I've seen a few that way but not sure if that is standard practice.

Example

e |-----------------------|
B |-----------------------|
G |-----------------------|
D |-----------------------| <---- Rythym
A |-----------------------|
E |-----------------------|

e |-----------------------|
B |-----------------------|
G |-----------------------|
D |-----------------------| <---- Lead
A |-----------------------|
E |-----------------------|

e |-----------------------|
B |-----------------------|
G |-----------------------|
D |-----------------------| <---- Rythym
A |-----------------------|
E |-----------------------|
#4
Some i see do this:

e |-----------------------|
B |-----------------------|
G |-----------------------|
D |-----------------------|
A |-----------------------|
E |-----------------------|
...|
e |-----------------------|
B |-----------------------|
G |-----------------------|
D |-----------------------|
A |-----------------------|
E |-----------------------|