Global is good for the everyday use in kitchen. It's a bit lighter than western brand brands.
Global blade is very hard so, you need to take more effort when sharpening it.

1. no. You need to buy sharpening steel, sharpening stone,
2. Main Knife/ sharpening steel / paring knife  are the must have in you bag -
3. This is good enough for beginner or you can try a basic Victoryknox which is a bit cheaper.
4. It's make you prep faster. You will understand if you have to deal with 2-300kg of meat or chopping something for 6 hours.

-never know that there're global shop in thai