are you talking about an indoor wall or outdoor wall?
Where are you located? Depending on weather conditions the answer may change. How wide and tall do you want to go? Oh ya see the question from Holly also.
rock cement wall DIY on Pinterest tells you alot.
I’m gathering this is outside, yes?
Please check your local building department for their Prototypical Wall Details, which will cover footings & maximum allowable heights (without being Engineered and without permits).
Retaining walls have more design & construction criteria, if that’s what you need.,
Concrete is not the same as mortar, of which is the appropriate medium.
You might rent a wet tile saw for dressing some of the stone, depending on how irregular it is.