First one major thing is to always get Eng Oil and Filter changed on time. This is by far the most important of all and will help to prolong life of engine which obviously is most important part in a car.
You dont have to use Suzuki genuine oil but I would recommend using genuine Oil Filter.
If you have time I would recommend you to watch ChrisFIX or Scotty Kilmer on youtube for videos on basic car maintenance
1) For POLISH it should only be done every year or 2 years because every time you polish you are removing a layer of your car's clear coat which is limited. WAXING is what is usually done on a weekly or monthly basis as it is a protector for your car's paint.
2) For tyre pressure it is written on driver door jamb or owners manual.
3) Eng oil and filter should be changed according to guidelines in owners manual. Fully synthetic oils generally can be used for longer than Mineral Oils
4) Air filter also according to owners manual or according to condition when you see it has become quite dirty then it is time to change.
5) Depends on the type of scratch, small and minor scratches can be removed with a compound or polish usually. If its a deep and major scratch then it may need repainting.
6) Rotation is recommended and good as it can help and prolong the life of your tyre, generally rotation is done every 10,000kms or you can even check in your owners manual what it says.
7) Difficult to avoid swirl marks but you can use microfiber cloths and a proper wash mitt instead of sponge to wash your car.
Interior polish is not mandatory you can do it if you want, but its always a good idea to apply protector on dashboard to prevent cracking from sun (UV rays).