The Hollyhock is a 2-year-old plant, which means it lives for 2 years: in the first year, the plant grows and makes stems, leaves and roots. In winter, the stems and leaves die off.
In the second year, just before new growth begins, you can remove or cut away the old leaves. Then the plant will flower and make seed. After that, the plant dies off completely.
Hollyhocks can spread a lot of seed! If you don’t want them to grow everywhere, you can remove the flowers after they bloom before they make seed.
General care tips can be found here