I would recommend mining, as well as getting your fishing level up(thats also a good way to make money), because the second lake floor on floor 60, holds the fish with the highest price value of all fish(not including legendaries), The Lava eel, which when at max fishing level with angler it at iridium quality sells for 2,200g. but that would take a long while, fishing is your best bet early game, though one tip, when you have the money(which is normally in year 2 from experience) invest in pigs, in the money making business- pigs are your best friend, they make the money you spent on them back quickly by finding truffles, which with the right upgrades can bring in tens of thousands every day. but in early game stick to fishing as there are some fish in spring and summer which if you can get a good ammount every day, you will make more money quicker then farming.