Buy nipple cream. It will help with those first tender feeds.
Buy nursing pads. Be prepared to buy in bulk.
Buy several nursing bras.
Buy nursing covers or nursing tops if they make feeding more comfortable.
Consider buying cabbages. The leaves will help relieve tenderness.
Talk to people who have breastfed before for advice.
Consider taking an antenatal class about feeding.
Find out about local lactation experts.
Find out about local breastfeeding cafes with experts and other mums.
Research the best foods to eat while breastfeeding. There are plenty here: https://www.smababy.co.uk/newborn/what-to-eat-when-breastfeeding/
Research healthy snacks that could keep up your energy while breastfeeding.
Take a daily supplement containing 10mcg of Vitamin D.
Consider cutting down your caffeine intake – there’s a recommended limit of 200mg a day.
Consider buying a breast pump so others can help with feeds at some point.
Buy a breastfeeding pillow to make feeding comfier.
Buy lots of muslins. Breastfeeding on demand can mean a lot of leakage.