first question.
well. i made a folder called TWA and put all my twa files in there.
when i want to open one, goto the command center (after you have initialized game) click on the game letter you opened. then go to archive in the top left and goto import game.
import the twa of your choice, big bang the game, (starting with current data). maybe change some settings, then bingo, you are good to go.
twa files:
http://www.damageunlimited.com
http://www.shipdestroyed.com
http://www.coastgames.com
http://www.blacksuntwgs.com
(some people will say coastgames is down, maybe a direct link is, but if you use google, you can still get their twa's.)
Slim