Hello Manuel
I am not sure why you have not find your right person yet . What kind of life partner do you want to find ? Anyway , I will try to answer your questions firstly here .
1 There are different Chinese visa for foreigners , includes Crew (C) Visa / Resident (D) Visa /Business (F) Visa / Study (X) Visa /Visa-free entry & Transit (G) Visa /Employment/Work (Z) Visa /Tourist Visa (L Visa) , As for your situation , you may consider D or Z , but you would better ask the detailed information from the Chinese consulate of your country .
2 Yes, it is convenient for you to use the internet . As for the prices , different city has different prices , but not too much . But you would better find a apartpent firstly , because most apartments in large cities you can use the internet . 200$ -300 is enough . Maybe different , you can ask the local price when you come to China .
3. As for computer price, that also depends on what kind of computer do you want to buy , you can find the exact price from the local market . And when you go to one city , you can tell me , I may help you find more information of the local place .
4 .Shenzhen is an international city , so the cost of living and relevant salary are higher than in other smaller cities . And different jobs has different income and some even has a large difference .
5 Yes, healh is always the first , you can inspect your body regulary in the hospital or you can buy a safe and health insurance in the local city .
Anyway , hope you will be more clear with my answer , wish you have a nice time! Good Luck ! :heart: