I think this website is a good source of evidence based vegan diet information, and it has some recipes too: https://www.scepticaldoctor.com/

I've always found it easy to substitute foods not replace. I tried originally going vegan by giving up all cheese but that was a huge dietary change that was not sustainable for me. I would definitely say it is now possible to keep one's current diet while replacing the animal products. Vegan meat, milk and cheese have come huge ways. I make this cheese all the time now, I like simple, unpretentious vegan food.

https://shaneandsimple.com/vegan-cheese-sauce/

For supplements, I take Vitamin B12, Iron, and Omega 3. Many people are deficient in these, vegan or not. Things get a lot easier, and after I modified my existing meals it was a really easy change for me. Also I am probably healthier now without all the fat from cheese :P
 

I love vegan health org! It's my favourite one and use it for most things! There are some resources on here (with more coming soon).  This vegan power smoothie is good too! 🍹

I'm not sure how reputable it is, but I picked up a used copy of Becoming Vegan Comprehensive Edition and have consulted it from time-to-time for vegan nutrition.