You can burn 1k in one hour. And if you do maples you have to spent the double amount of GP as you do with willows but you save 1/3 of time - it's your choice.
You have to wait for a week or so to get your lobs or tunas sold. Just wait as I did. Other methods to get money: Mine coal or gold, cut yews or sell raw food.
You can get 99 FM by burning around 140,000 Willows (22 each) that means around 3M only but it takes awhile (i think 1k logs per hour to burn) and gets boring after a few hours.