Hi gottodoit, welcome to your new way of life. You will find many people on here who will give you advise if you just ask. First thing to do is to check out your tdee, that’s your energy expenditure. Go up the top of the page and look in how it works. This gives you a marker so you can understand what to keep to on normal days. Fast days for you are 600 cals or less. It is a bit difficult at first so give yourself a week to settle in then adjust what you have experienced. Try leaving out some of the carbs as they work out expensive when other choices would fill you up more. Drink water and thin soups to keep you going, a little salt is necessary. Start walking gently if you can. Read the forum. Look for a thread that suits your situation and just ask to join in.
People on here will encourage you. Are you in the UK or somewhere else, lots of different nationals doing the 5:2.
Keep us informed of how you are managing. Best wishes.