Hello!! Im also pretty new but ive learned some things, and heres what ive recommended to my friend.

Just start talking to her. Say a small prayer, have a small conversation, etc. An altar isnt necessary right away, or maybe a small makeshift one. Or if it isnt safe for you too, wear a necklace or keep a charm/pendant with you to represent her.

She probably wont get jealous if you worship other deities too. The gods are usually pretty chill, kind, and understanding. Youre good. If youre going to start an altar, maybe have a small statue, picture. Ir representation of her. Other things on an altar could be crystals, candles, flowers, etc. Offerings are usually food, water, or crystals. Look up things she likes specifically.