advice needed ^^

I'm a baby helpol yes and I'm worshipping lady aphrodite. my parents are strictly Christian and I need help.. is it okay if I keep my altar in a box? it's not much in my altar and I'm hoping it's not wrong for me to have a discreet altar. other questions: do I need a candle? and what can I offer to lady aphrodite? I'm trying to build kharis at the same time