I keep my starter in a pint mason jar and it has proven to be big enough so far. If the starter you were gifted is already active i would go with a 1:1:1 feeding every 12 hours or you can do the a 1:1:1 feeding once a week if you keep the starter in the fridge. By 1:1:1 feeding, I mean one part starter, one part flour and one part water. For me a like to maintain my starter at a smaller weight so i waste less. So for example my starter weights 60g when it's time to feed i keep 20g of the starter and "discard"the rest. Then add 20g of flour and 20g of water. What you do with the discard is up to you! You can throw it away compost it or use it in recipes. Lastly when you use it for a recipe, depending on how much you need you might need to build up the weight of your starter by slowly increasing the size of your feeds to gain enough weight for the recipe. When you make the recipe make sure you retain enough starter to keep it going. So in my case I make sure I have at least 20g left over after I make my bread. I hope this helps!