I want to make interior walls look like stucco
I love textured walls - it's so much fun to do!
They sell mud in boxes that are a few gallons - and plastic tubs that have more in it. For my livingroom we did a very heavy texture (used strips of paper and smothered the walls - and then drug the paper down the walls to give a very choppy plaster-paint look) and it turned out well - we then used two tones of paint, one darker first and then a lighter dry-brush coat so the walls were two-tone and the texture stood out.
Depending on how big your wall area is to cover you might need just 2 boxes (one big bucket) or more to do the texture. . .Where I live one box is around 9/10 $ and a bigger bucket is $15.00 - so consider cost, too. A large room could cost between $50.00 and $100.00 depending on how much mud you use.
However, mud won't stay up on a surface that's peeling paper - so be certain that all loose bits are off, first, and that it'll stick - you might have to paint with kilz, a primer.
At this present moment in time I am making cabinets for the kitchen - just in case you wanted to know what I'm doing when I'm not around.