For crops you get tools which are in the chest right next to your house(happens after redd tell you to clean the farm and use the tools to plant) Use plow, then plant seed (can be purchased for Laura in shop) use watering can to water them everyday (no need on rainy day, water can be filled from the well). Once ready just stand on them and enter. For fishing you get your first old fishing pole from Aaron once you have gone to forest 10 times with him ( if I remember correctly after 10 times he introduces you to fishing and you have to catch on big wray fish show it to him and he gives you the recipe for a new pole) Also you can talk to fisherman near the fishing spot he will give you a quest, completing it gives you recipe to craft a sinker. You require earthworms to fish you can find them in forest area or fishing area - got to fishing area - equip fishing pole - take earthworms in hand and enter/space.