To milk the cow you need cigarette and milk her 3 times on different days.
first one cigarette you will recieve when you save donkey(wife)(top left corner on the cave map) from the mine cave, after this he offer you create cigarettes with 2 ingredients and money (plant pepper seeds, and some purple seed from store-read description of items there something about america), sell something at the store, good income from meat from top mountain but you need to give 200 wood to fix the bridge there, but i think it is 80+ per item in store, do farming, when you use first slot item on the ground you have chance to get the bait for fishing for free and sell fish after.
Or try to cheat save file here
https://f95zone.to/threads/village-rhapsody-v1-2-8-yoogame.132929/post-9260814