brilliant that you have family there from day one to help you out and yes soooo scary leaving good jobs and home in uk to start up again , but whole family will benefit a better out-doorsy lifestyle which we crave for sure.
we chose to fly out with Singapore airlines purposely to spend time in changi airport, only for a few hours, not a holiday,.there is so much for the kids there to do to tire them out ie swimming pool with slides and showers to freshen up between flights, cinema, science rooms, butterfly gardens, and a train to take you through the malls as its huge. not mentioning the biggest indoor slide made lol. we found other airlines slightly cheaper but stopped at places like Dubai (which you be brilliant to take a holiday), but not so good just sitting around airport with two kids and not much to amuse.
im sure you'll sell your house in no time and be booking flights soon after. we felt much better once we had a date in stone as like you said the 'no known' is not good. we hope July is a good time to move with it being their winter, give the kids a chance to climatize before the big sun comes ;-)
we thought that jobs would be like you say, easier to find once landed. hoping to have two months of searching and getting to know the place before work, but applying in the meantime.
we are also keeping fingers crossed schools will be easy to get in to, even though we have emailed etc, you have to have to have a fixed address in the catchment to gain place and that slightly worries me if the school in our area is full or something.