1.by course, you can get accepted for sure (200%)
2.have no idea
3.it's like professional training. So coursework is OK for job hunting. if you want to continue PHD study, better do a thesis based MS
4.no need agent, you apply, you can get accepted for sure. course MS is so easy to get accepted. Easier than you think. (I want to be an agent, it's so easy to earn money!!!)

note: if you have enough money, you can try US. A lots of US top universities send out huge amount of coursework MS admissions every year.

the most famous two are USC and Columbia university
USC engineering ranking is TOP10 in US, but it's even easier to get accepted than NTU and NUS for coursework MS...you don't even need GRE and recommendation letters. You can be accepted even you are from huaiyin college (ranked 500+ in China). you can be accepted even with GPA below 70....

It was said that in the past 5 years, no single person get rejected by USC for coursework MS....

Columbia is also easier to get in if you apply self-support MS.

of course you need to spent 60-80K us dollars for your two years' study.

UK top universities are the same..feel free to apply Cambridge and Imperial College for coursework MS. You will be surprised to receive so many Admissions....

Now the trend all over the world is you just need to pay money to get accepted by coursework MS program. They don't care 20 students in a classroom or 50 students in a classroom. no much difference for a professor but they can earn a lot of money. For coursework MS student, no advisor will be assigned. no office , no lab and no advisor...just pay money for the course offered and hunting for a job.. actually it's not bad, you can sometime get job offers from Microsoft and cisco

fully supported PHD is difficult to apply in US