I've had a few ideas on that myself and from my perspective we have a few options. One of which is to just completly drop the link to Gundam W for the series, which allows us to not worry about having to figure out how to explain what happened to the characters people know from that series. However, let's just go with what can be done if we build on the Gundam W series.
We can either do the story from before the three year jump revolving around everyone going to arms and a new war starting with possible story arcs being Jyotika, Blace Lowe, and the FRE Faction, two of those semi took place, while the remaining was just something I came up with for the RP.
The first episode would probably have to either be heavily narriated to put it into perspective, or could be shown in flashbacks. This could be through the eyes of one of the new main characters, seeing the events of AC 195 and probably 196 then moving in to the AC 199 storyline.
Another option is to start in the current timeline of events in AC 201. Again we'd have to either rely on nariation or a flashback. The plus to this is we can show of impressive "war footage" early on that we just make up showing the War of AC 199.
Characters should be the ones that actually participate or did participate. I'm currently getting back into things since I've been asked by a few people and I've gotten my mind clear. But anyway, not to get off topic. This is why I think we should try and have a meeting in some form of chat, whether it's aim, the one on here (if it still works I haven't checked it since before the forum went down in Dec) and everyone get on the same page.