Written for Malachain: the essentials, without the noise.
Rules about games work when they are predictable, agreed in advance and the same every week. Decide together how many hours, which days and which times are off limits, such as meals and the hour before bed, and write it where everyone can see it. A visible timer beats a parent calling from another room every time.
Learn what the games are and play one yourself; it makes the conversation about content easier and earns the right to set limits. Use the console's own family controls for the parts you cannot supervise, and keep the console in a shared room. The aim is a household where games are one enjoyable thing among several, not a daily battleground.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.
It also helps to talk the subject through with friends or colleagues who have tried something similar. Their experience points out the details that guides leave out: how long things really take, which costs were unexpected, and which shortcuts turned out to be a mistake.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.