Hi tingting,
No problem!
Well... it's not too late to start preparing since you're planning for June. But sugest you start now, especially with the date being a popular kind of date, alot of venue may be booked. And with confirmation of venue sourcing, then of course confirm your JP. Many good JPs are booked up to 2007, so better act fast. I suggest JP Chan Kai Yau. He's my JP and a very friendly old man.
Basically, priority should be:
1) Confirm Date & Time
2) Confirm Venue
3) Confirm JP
4) E-file (within 3 mths fr ROM date but not later than 21 days b4, ie at least have 21 working days b4 ROM date)
5) Source for your wedding bands(at least 2 mths b4)
6) ROM Gown, Shoes, hand bouquet
7) Photographer/Videographer (optional)
8) ROM Favours, invitation cards (Optional)
Heh... this is how i would or rather have planned my own ROM. Good luck to you!