This is a simplified guide to the wonderful world of kingdom management. I won't be displaying any charts or explanations of the formula used in the minigame as there are other guides for this.
For starters, what you'll need.
- Between 1m and 1.5m
After you've done that, do the next obvious thing and take your 100% approval rating and your money to Adviser Ghrim. I suggest a setup like the following:

Most of your profit is going to come from nests, which is why Wood is at the maximum. When crushed, they sell for quite a nice price considering you're getting a fairly large number of them.
Every day, your approval rating will go down a little bit, and 75k will be subtracted from your coffers, assuming you have over 750k in there. For maximum profit, don't collect every day, as nests are generated based on the percentage of logs you get. If you collect every day, you won't get as many nests as you would if you collected twice a week.
After four days, this is what I collected:

Now, none of the rings sell for anything, but you can use them for other things. Also a lot of the lower level seeds don't sell, so I usually drop them. After selling everything at the Grand Exchange, I made 766,016gp. Considering 300k was subtracted from the coffers, I'm left with a profit of 466,016gp. Or, in other words...
A profit of >100k a day for doing nothing!
Kingdom Management is my kind of minigame: The kind with huge payout for no effort. Thank you for reading this guide, and enjoy your free money.