Well, here is the resource for you:
http://fifaworldcup.yahoo.com/06/en/tickets/index.html
Their whole system is complicated. In the first round people were buying tickets for games without knowing who is playing. In the second round people were given a chance to buy ALL tickets for a given team- but Italy, Spain, USA, Sweeden, England and other good teams were already "sold out"- nobody knows how that is possible. Third round is coming up in December and people will know who is playing when, how and why. So it is expected that there will be tens of millions of people in the lottery. My advise- when tickets go on sale, be online on that day exactly at 12:00 p.m. CET time, but be ready for problems- there are some 9,000 hits per second on their website.
To answer your questions:
- no, you can't buy any tickets between now and december
- no, you cannot place an order
- you should look for the day when tickets go on sale again in round 3
- hope that you will be a lucky one
(that's what I'm doing)