Start with electrical requirements, then check datasheet limits, thermal behavior, availability, safety margin and compatibility with your project.
Cheap modules can work for prototypes, but you should verify real current rating, heat, protection features, documentation and long-term reliability.
Yes. Use related calculators to estimate current, voltage drop, power loss, heat, range or runtime before selecting parts.
Range depends on antenna design, frequency, link budget, path loss, cable loss, installation height, interference and receiver sensitivity.
Yes. RF performance changes with enclosure material, ground plane, placement, nearby objects and installation height.