We have chosen these two EDF but not sure which one to order?
Motor selection is primarily driven by the all-up-weight (AUW) of the model. You have to have a good idea about the weight of the model before you can reliably do motor selection.
I have found that people have been using 60A ESC for this EDF. Do i need 2 ESC's for these 2 EDF's. Or Can I use one 120A ESC for both of them ?
I want to keep the weight as low as possible ?
which batteries should I choose to power these EDF's ?
With brushless ESCs, you do NOT want to put two motors on one ESC. Since they are feedback driven, two motors will confuse the ESC, and you will have to spin one of the motors with your hand to get them both in sync and running. So the short answer to your question is that you have to use separate ESCs. And having 25% higher capacity on the ESC from what is specified in the motor ratings is somewhat of a standard practice.
BTW, there are certain brands/models of ESCs that support this, in case you insist. But they are generally expensive.
If you go for a 4s lipo, you will get the maximum power from the two motors listed above, but make sure you have a charger than can reliably charge a 4s lipo.
If I order my items through hobbyking, will it be customs hassle free ?
And what precaution do i need to take while ordering ?
Ordering EDFs and batteries should not be much of a problem. You may be asked to pay customs (or not, depending on your luck!). Remember that normal shipping plus customs checks etc would mean 2 to 5 weeks for the item to be delivered, as reported by others.