Tips and Tricks

Farming

The range of water on farmland.

Get your farm started with /kit claim seeds, which grants a small amount of each chem seed.
Dirt crops (Wheat, beetroot, carrots, potatoes, sweet berries, melons, pumpkins, and bamboo) all require a minimum of light level of 9 in order to grow. If you can't plant your crops, first make sure that you have enough light. The following are the only types of crops that do not require any light to grow: Cactus, chorus flower, nether wart, glow berries, sugar cane, and cocoa beans.
Be efficient with your water use. One water source block will hydrate farmland in a radius of four blocks. You don't need to have water next to each block of farmland. Example - this is the most efficient use of water.
Likewise, make sure to maximize the efficiency of water placement when farming sugarcane. Example.
Take advantage of Auto-Replant and Extra Drops to maximize efficiency for manual chems.
Level up your mcMMO Herbalism level to increase your chances of doubling crop drops.

Always plan your routes, and have a backup route in case your route is blocked by police.
Take advantage of speed and invisibility potions - police aren't allowed to use speed potions, so unless they have a mount or use their speed boost, you will always be faster than them.
Waiting to sell your chems until a Chem Price Booster is active can be much more profitable, but it usually means there will be more police online.
Take advantage of all of the spawn exits, don't just use the main front/side exits.
Use F5/third person to look for police behind you without losing speed.
Certain cops usually have regular camping spots - take note of where they like to camp so that you can plan the best route.
Understand the abilities that police have. You can see police abilities on the Police article.
Sounds can be used to your advantage. If you don't want sounds on, turn on subtitles.
Prison can be very profitable, as it's value rate never drops below 1.00x - but be cautious of other players, as PvP is enabled there!

When posting a runner job, take the price of the chem being sold into consideration. If you're posting higher value chems, you can probably lower the cut. Likewise, post higher cuts for the low value chems.
Tipping good runners is an effective way to keep them reliable and likely to run for you again.
See Runners for more information on Running Chems.