Law / Employment forms and ZUS help (contributions as a self employed company in Poland) [4]

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ZUS for own company in Poland

Hi,

Im planning to register a new company for an online shop. The registration is simple, but I get a little lost with the amount of ZUS i have to pay. Im reading about ZUS discounts etc. Couple of questions:

1. From when I need to start paying ZUS?
2. Is this ZUS to be paid monthly, quarterly or annualy?
3. What should I exactly pay? Important is that I already have a full time job, meaning I already pay some kind of ZUS.

Is there anything else I should think about?
Thank you in advance!
SP