When you join a DarkRP server for the first time you probably don't have a lot of money to start off with and need some to start a business or just buy stuff. This is one of the easiest methods of making money in DarkRP.

Firstly you need to find a house or building to live in, its wise to find a spot that is in the most unpopular parts of the RP map to avoid raiding, you could also build a base to prevent raiding if you think you will be raided.

Once you have found somewhere to make money fast go up to the front door and purchase it and all other doors involved with that building

This section depends on what server you play on since most servers use different printers from others, but this shouldn't be a problem since all money printers work in similar ways.
You have two options for buying money printers, either you buy a cheaper one and fully upgrade it or you buy a more expensive one and not upgrade it at all.

Now you can set up the printers how ever you like but on most printers there is a time limit or overheating system, to deal with this problem just spread out the printers so the do not get too hot or purchase a cooler for them.

Once you have dealt with the overheating issue and made sure your printers are safe and wont get too hot you can then upgrade your printers to make them go faster, hold more money, stronger case or make them silent if you want (upgrades depend on server)

On some servers there is a rule on who can have money printers, you will have to ask an admin about that since that also depends on the server you are playing on.

Once you have done all of the steps you are ready to get rich in DarkRP, happy printing.