Morsel has some good advice there, the biggest mistake with someone buying a whole bunch of veggies for the first time is they buy too much and they go bad before they are used. The longer a vegetable is sitting in your fridge, the more nutrients it is losing. A debate has raged for years that as frozen veggies are 'snap' frozen early they retain alot more of the nutrients. I only use frozen veggies when really necessary, like frozen peas for a curry.

We plan meals and write down all the ingredients that we don't already have, mostly fresh veg. if you only need 1 zucchini only buy 1 zucchini. the meals need to be worked out in an order where you can use up the veggies that will get spoilt the quickest, i.e. bean sprouts only seem to be good for a couple of days. Whereas carrots, potatoes and onions will last longer.

We keep the list of meals and refer back to it during the week to work out what to make next and what needs to be used up
You'll get the hang of it. We pretty much stick to 1 medium size recipe book, puling a few old faves from memory now and then.

and I agree, processed veg meat substiutes are over priced. Get used to cooking just veg in different ways, try adding fruit, like apples, to curries. Vary the style of cooking and where the dishes come from, there are many good vego dishes from many different countries; mexican, italian, thai, chinese, indian (lots!).

but most of all, enjoy making the dishes and enjoy eating them, this will reinforce the desire to learn more, try more and keep at it.
good luck, you have our support too!