Sunny, you can check out the Calla Lily cubit
It depends on the flowers, are they white or colored? Cutting the blooms off Callas won't give you more flowers this year, but it will help the bulb grow bigger and give you more flowers next year. (Flowering takes a lot out of bulbs, energy-wise.)
If they are colored, just let them die back, and then either lift them or leave them in the pot, but let them rest for about 6 weeks and then they should start growing again.
If they are white, they should be growing now. Don't overwater and give them a lot of sun. Callas really aren't indoor plants.
Callas are very easy to grow from bulbs, prices range from $1 to $20 for the new and rare, you can plant them out in the yard. Getting them cheap from Lowes works too, the ones here had Captain Reno (dark purple) and Captain Cupido (cream white), which are top- price varieties.
