To prevent damage to your jewellery I recommend you store it safely away from other pieces to avoid scratches. 

You should keep your jewellery away from harsh chemicals, such as cleaning or beauty products, to avoid discolouration to the metal.

Silver jewellery will naturally tarnish over time through oxidisation, it can be cleaned with silver polish and a polishing cloth.

I recommend cleaning your jewellery using lukewarm soapy water and a very soft brush and then polishing with a soft cloth.