@NearlyVegan
I am not a big fan of MFP because to them 100 cal of doritos have the same value of 100 cal of walnuts but when you go into the micronutrients, fibre, antioxidants, omega 3 and so on it just makes no sense.
It is so very important to avoid becoming malnourished so it is very good thing you are looking for answers.
This is why I would recommend a nutrition book www.amazon.co.uk/Becoming-Vegan-Comprehensive-Reference-Plant-based/dp/1570672970/ref=sr_1_1?s=gateway&keywords=becoming+vegan&tag=mumsnetforu03-21&qid=1555529928&sr=8-1 .
You can find some very long interview of Brenda Davis on youtube filmed at conferences
Not all veggies are make equals, and some might be high in calcium on paper but this is not available to human so their real calcium-content for us is almost non-existent . A good example is spinach, very high in calcium but only 5% of it can be absorbed and the 95% will be taken away by the oxalic acid and end up in your toilet bowl next time you do a poo.
A lot of vegan are extremely malnourished to the extend to die of heart attacks because they ignore the omega 3 and taking a pill doesn't work, so you need your flaxseeds, walnuts, avocado.
Listen to this conference
But again, careful because too much omega 3 is dangerous, so maximum 2 table spoons flaxseeds.
You need to get your micronutrients from the food. More and more studies are published every week about how a vitD pills raises the vitD in your blood but doesn't give you the protective effect of the natural vitamin D, the same with calcium (here it is even worse, they cause precancerous polyps in the colon) , and so on.
Try to get all the nutrients, micro and macro from the food, including vit B12 from nutritional yeast and a great variety of vegetables. try to eat 3 or 4 different vegetables every day, so in a week you have had at least 20 different veggies in your plate. It sounds undoable, but is actually a lot easier than you think. Visit a Chinese supermarket, and you will see so many different types of bok choi and other Chinese broccoli. I buy a lot of my tofu in the Chinese shops as I like the very hard type and there I can find the Taiwanese . I can guide you on how to buy and prepare tofu (think of tofu as a blank canvas, and imagine the difference between the white canvas and the Mona lisa) . Never buy the soft or silken one unless you are doing a cream or sauce!
Being vegan without tofu/tempeh/seitan is going to be hard and you will then need a lot of lentils, chickpeas and beans. Do consider nut butters, but only the 100% one not the nuts+oil+sugar. In the morning, sometimes, I have spelt bread with peanut butter and cubes of papaya .
Once you go with a fine comb into nutrition, you realise it takes a lot of planning to get everything from food. You can't waste morsels to crap. A friend of mine is a fifty-shades-of-beige vegan and will have rice crackers, chips, coconut yoghurt and so on. She puts the focus on what she doesn't eat (animal) rather than what she eats. She is then tired and eats vegan chocolate to get energy.