Kiwi, what do you like to eat? Are you big meat eaters? Do you like pasta? Rice based dishes? Soups?
What dishes do you know already that you are comfortable cooking?
Can your husband teach you any of some of yall's favorite dishes if you have them?
It's a big topic.....I have many cookbooks but I still go online to get recipes and see that many sites have short videos with step by step preparation instruction that I like to watch sometimes if I don't know the recipe.
As far as a roast, don't give up....they really are easy once you get the hang. Direction depends on the kind of roast you buy but most all of them start with a dry rub of a mix of spices, even just salt and pepper and garlic powder and/or onion powder if you like. Then sometimes I either brown it on both sides in a little oil on the stove and then put in a baking pan in the oven at LOW temperature (300 usually) and walk away from it for several HOURS. Or just skip the browning step and start it in the oven. Some roasts or beef will get tender the longer you cook them. Like brisket or ribs. If you want an actual roast beef then that needs to be cooked differently.
For baking, I don't know what else you've tried before, if never then try simple first...Like making a banana bread....baking is normally something that depends upon good measurements of the ingredients being used.
I have made a mess of many many things I've cooked over the years and when I do I just throw it out or feed it to the dogs, lol. And then try it again if I want to.
What an adventure for you!
P.S. Just curious, is 6300 the altitude you lived at?