Hey there!
I turned vegan about 5 years ago, from being pescatarian, then vegetarian.
I would recommend doing a search for alternative protein sources (though proteins are not hard to get by on a vegan diet, despite the myth), you could go the healthy/cheap way, which is to cook with lentils, chickpeas, kidney beans and try curries and chilies which are usually pretty simple and healthy.
For a bit of fun you could try meat substitutes, they can be quite good, I personally don't buy them often, but it can be a good way to transition.
I personally loved watching Youtube videos of vegan cooks, it was so inspiring!
The suggestions from everyone here are great though! Mostly focus on what you enjoy, what you like cooking, and substitute things.
For cheesy flavour, I recommend nutritional yeast (sold in Sainsburys), I sprinkle it over pasta and in soups. To make your own cream sauces, I blend cashews with water etc. etc. These are all tips and tricks you'll figure out as you go along, but mainly keep it fun and light hearted!
It's one of the best ways you can improve your health and the health of the planet (and reduce animal suffering) <3
You can DM if you've got any questions :)