Your jewellery will come with a polishing cloth to keep it shiny.
You can also use a little warm water and soap and gently rub it with a toothbrush if it gets very tarnished but I would avoid chemical cleaning solutions. If you have a lot of jewellery you could buy an ultrasonic cleaner or use a tumble polisher.
Silver will tarnish naturally with contact to your skin, the air and any chemicals it comes into contact with. In order to avoid getting it too grimy avoid wearing it in the shower or a swimming pool, spraying it with perfume and keep it stored snugly in the box I sent it with or a jewellery box. But be careful not to let your jewellery box get too crowded so that they don’t get scratched.
Any questions, give me a shout.