You will want to start a training regime of some sort and start acquiring skills you'll need on your trek. The more you plan and prepare, the more chance you'll succeed.

One good resource for asking questions and finding hiking partners will be the mailing list pct-l. You can register for it here:

http://mailman.backcountry.net/mailman/listinfo/pct-l

You can find free topo maps of the entire trail at:

http://www.pctmap.net/