Thank you guys for your replies.
I guess, I just needed to know that having my background it would not be impossible to have career in ISs.
Thanks for your honest opinions and encouragements :)

My partner is Polish which, I assume, is not the demanding subject in ISs.
She does have a Masters degree in American studies and Diploma in theater (which could be a plus for her).

I have thought it through and just want to weigh all my options.
I love my freedom and my research. I do not imagine myself out of academia. I am just hoping that perhaps with ISs, I might get to do both eventually without facing immense pressure of publishing any bs work and can get to focus on quality research just on my own. And we get to maintain our relationship as well :)
Let us hope for the best :)

FYI: yesterday, while surfing on the net, I found a very interesting program specifically targeted towards PhDs called "Researchers in School" in UK.
The salary seems nice around 30-36k from the very first year + I get to have extra free time for my research + teaching experience + QTS :)
If I can get into this, it would be quite ideal for me. I get to have a break from professional research + get to have cert in case we both decide to have career in ISs.
This also opens a possibility for my partner to get her QTS in UK :)

Hi, I am a very fresh Ph.D. in Quantum Physics.
I am from India currently living in Europe and in a long term relationship with a european english teacher. Both of us are below 28.

I am thinking to take a break from professional research and perhaps go into teaching in International Schools preferably at secondary or above level.
I can teach Physics, Math and Comp. Science which seem to be in demand. But I am not a qualified teacher.

I would greatly appreciate any help and suggestions on the following points. Thanks.
1) Coming from India, (being not native english speaker + indian accent + visa issues ) does it affect my chances of being accepted at a good IS?
2) For long term teaching: which teaching certification should I go for?
a) There are some online courses based in US and UK, which require considerable amount of money (it could be an issue at present)
b) another option is to go to UK, enroll in School direct program (Salaried perhaps) which consumes time but it has an option of obtaining some funding.
c) I'm also thinking to apply for ISs where they might hire without experience or teaching qualification and while doing so obtain a teaching certificate.
3) My gf is european and she teaches english. She holds a qualified teacher certificate but not from english speaking country. Would that qualify her to teach in a reputed IS?
4) We would prefer to find some place in Asia at the moment perhaps Singapore. I would like to know what are the chances of finding an IS in this region given our backgrounds?

What would be the best course of action for us?