Shamas Suleman Arshad, if you want to create a scale from its foundations, I think (as was suggested above) you don't want to use AMOS (not at the early stages, at least).
The following articles might help you:
Boateng, G. O., Neilands, T. B., Frongillo, E. A., Melgar-Quiñonez, H. R., & Young, S. L. (2018). Best practices for developing and validating scales for health, social, and behavioral research: A primer. Frontiers in Public Health, 6,149. https://doi.org/10.3389/fpubh.2018.00149
Trevethan, R. (2009). Self-assessment of foot health: Requirements, issues, practicalities, and challenges. Journal of the American Podiatric Medical Association, 99, 460–471. https://doi.org/10.7547/0990460
I wrote the second of these. It is concerned with the measurement of foot health, but its principles apply across many areas. I put a copy of it on ResearchGate.
Here you go! The first article proposes a paradigm regarding scale development. Also, you may wish to re-validate our measures in new contexts/settings.
Article Developing and Validating a New Multi-Dimensional Scale for ...
Article Validating a New TQM-Benchmarking Measurement Model in an In...