for printing of invites, you will need to wait for your coordinator to email you the letter which you can show to T-dragon. My wedding is in June and we received Huiling's email on checklist and printing of invites in Feb, which i think was very responsive of her cos at that time we haven started planning anything yet.
In my opinion, no point print invites so early cos nearer to wedding date, there will be adjustment made to the guest list and you will need to increase/decrease the no of invites to print. If there's a need to increase printing invites later or need more cards, there are additional charges to incur. So, print your invites when you have more or less confirmed the guest list.
We selected cards in early Mar and will be going down to collect the printed cards tmr. They quite speedy in their replies and have all the templates ready so the process was a breeze. Mostly the delay is on our part cos too lazy to look at the artwork they emailed over =p
its 10 weeks to my wedding and I have not call Huiling to discuss anything yet haha. I guess we need to confirm the menu and arrange for food tasting next...