Reviews sell products, and need managing.
ENABLING THEM
WooCommerce > Settings > Products. Enable reviews, and decide whether to restrict them to verified purchasers.
Verified-only reviews are more credible and prevent most fake ones. It also means fewer reviews, which for a new shop is worth accepting.
MODERATION
WordPress settings control whether reviews are held for approval. Hold them at first, so nothing abusive appears unseen.
RESPONDING
Reply to reviews, particularly critical ones. A calm, specific reply to a complaint reassures every future reader far more than the complaint discourages them.
Do not argue. Acknowledge, explain briefly, say what you will do.
GETTING REVIEWS
Ask, after delivery, in a short follow-up email. Most satisfied customers will oblige if asked once.
WHAT NOT TO DO
Do not write fake reviews or buy them. Customers recognise them, and it damages trust more than having none. Do not delete genuine criticism. A page of unanimous praise is less believable than one with a mixed review answered well.