Visit an Art Supply store. The people there know exactly what you need to use, and can offer different techniques, and the materials needed to do the technique successfully. These stores serve college students in Engineering, Architecture, and Art schools.
If you have a college or University near you that provides instruction in any of these fields, there will be an Art supply store near the campus. Trust me. I worked in such a store during my final year as an undergrad in 1968-69. The store is still there, altho under new owners.