I have milk goats. I have made cheese and butter from their raw milk. Without going into unnecessary detail, there are many factors that affect how much cheese/butter you will get from a gallon of milk (and it can change throughout the year). On average I will get about 1 pound of butter from 1 gallon of milk. However, my goats' milk it much higher in fat than whole cow milk, like double or more. I also have to separate the cream from the milk first. In the end I have butter, buttermilk, and skim milk.
If you want to try making your own butter, I suggest you get heavy whipping cream. The higher the fat content in the cream, the more butter you get and the faster it will churn. I believe cow cream needs to be room temp to churn. You can use a glass jar with lid and shake it. Lots of videos online.
As for cheese. There are a lot of different kinds of cheese with their own methods of making them. Some are easy and fast, and some are complicated and can take days. The most basic cheese would be an acid cheese, often called farm cheese. You can use lemon juice or vinegar. I don't know the method/measurements if you are making it from store bought cow milk, but there's probably recipes online.
I will also add, cheese making is a bit of an art. There are many factors that affect the taste and texture. It took me a couple years before I got to a consistency and taste of chevre (goat cheese) that I liked. Everything before was good but not great. And no, there is no "goaty" taste in my milk or anything I make from it.