You don't have to keep the plot of land for the trees to grow. 100 times 7000 per tree equals 700K profit. Plant new trees (100 to 200), in seven days you can do it again. Plan well on this by buying a plot, stripping it for every tree you can. This is usually my 'kick starter' fund approach to making money. Lumber and forestry is an amazing income if you lease the forestry harvester.

Instead store them and use them for the Potato sowing contracts. Harvest contracts always pay out unless you have Precision Farming DLC. I suggest 82's Logistics Fertilizer wagon. Lease a large capacity fertilizer wagon and immediately take four or five fertilizer contracts. This is EXCELLENT for getting a revenue stream going. Multiple Contracts Mod makes it easier to take multiple contracts at the same time. Just kind'a depends depends on how many farms are on your map. There is a mod 'Better Contracts' that will give you more jobs but I've found that the basic game will keep you supplied with plenty of contracts with minimal downtime. If you have a silo, store the product until the price is at its highest for the best payout, though sometimes cash in hand is needed more now than in the future. There are usually a few cheap pieces of land around your starter farm and those help bring the income in with more crop to sell. I also tend to buy land in the beginning.

Grass harvests are pretty complex, but you'll learn all the different pieces of gear to get them into bales and sell them. You learn what you need for potato and sugar beats, and cotton. You get to learn the other systems cause they'll make sure you have everything you need to do the job. Which is another good point of the job offers. You will almost always have to rent the gear. I've turned a 50K+ profit on them before. Those fill up the harvesters and trucks so fast, you end up having to do a lot of work running back and forth to sell, but the payout can be pretty good if you want to take the time. I tend to avoid the potato and sugar beat ones.

Money mod in farming simulator 19