If you lower the visual settings to low, the game speeds up and you make much more money but the plants grow at a slower rate compared to everything else. + for others to see.
Start off with Far East and max out dex and Far East weapons then work on the other skills of your choice. start taking villages and conquer another land. When you build your army or if you decide to go Ranbo, attack Nagoya and get that 100k unit. take over other places after and add to your army. + if you did similar or if it helped :)