wife is vege and i'm not but I don't get on with a lot of lactose so i tend to avoid as much dairy mainly milk as i can and it's easier to cook for 2 than to cook separately for both so most of our meals are the same so therefore i'm vegetarian when we are eating together at home 90% of the time. the odd time i'll cook separately if it suits.
dairy tbh is one of the worst things to ever happen. it's so bad for you. it's meant to be drank by calves to make them grow from like 20kg to 400kg. not human beings. peoples logic fails when you present them with this fact it's for calves not humans. also the way the industry is set up the stuff you buy is really bad for you pull of pus, etc. anyway i digress but i absolutely hate dairy and this is from a guy who loves his chicken, sausages and bacon, etc. but however having had dairy for so long it's been hard to remove it as it's in so many things. so if you have managed to do it i congratulate you. i use coconut/hazelnut milk instead of cows milk now and cut down normal cheese a lot but use paneer/halloumi from time to time however it's bad for me especially the paneer, halloumi i'm usually okay with. i also still use yogurt a lot unless you know of a substitute?
as for cook books don't bother. every recipe you want is online these days. books are dead.
go on instagram and follow fellow vegans. pinterest is a good one just type a few ingredients and then it brings you ideas.
mexican, indian, thai, stir frys is your friend.
rice dishes are better than those using bread. you can even substitute rice with cauliflour rice which takes 5 minutes to make from scratch. you simply throw culi into a processor. blitz for 10 seconds. then either fry it using coconut oil or throw a few teaspoons of water over it and microwave it. add peas to rice for additional protein. you can also add jeera (cumin seeds) for additional flavouring and also salt.
you can take any meat recipe and substitute the meat with either of the following:
mushrooms, halloumi, paneer, quorn, peppers.
use coconut oil for all cooking. potatoes are a good source of many nutrients so baked potatoes is a must at least once a week with beans, cheese, chilli, cottage cheese, etc.
wife likes pasta a lot but i've gone off it. you can add any veg you want to it like sweetcorn, courgettes, etc.
eat a lot of small things on the side like fresh olives, gherkins, cherry tomatoes, rocket. balsamic vinegar is your friend for salads.
it's not hard to eat different veggie stuff you just need to find what you like and what works for you. sometimes simplicity is best. yesterday for lunch i had beans on toast. however it was tiger bread and the beans i fried with a little coconut oil, tabasco, peri-peri sauce and habanero chilli seeds. a little of each to spice them up.