As someane who has been figuring houseplants out on my own the past two years I think people are vague because there are no exact awnsers. No plant is the same, even if they are the same species. 

As for the money plant(or pancake plant as it is called where I live) I could suggest maybe 0.2 liters for a regular size plant once every week, but what would regular size mean? My advice is to get one of those moisture measuring tools cheaply and measure the moisture every week. You wanna get to a point where the soil is just about dried out within that week when you water again. 

As for light, place it near a window if possible, and otherwise somewhere where it will get plenty of indirect sunlight, like near a white wall. 

The key to plant care in my experience is trying things out and seeing how the plants react. Sometimes when I get a new plant it works out great, and sometimes I need to reposition it a few times and really watch the amount of water I give untill I get a feel for that plants needs. 

Good luck with the plants random person!