My recommendations would be:
- AF-S 24-85mm f3.5-4.5 VR - its affordable, it renders well for a zoom, sharpness is no issue, its easy AF-S style useage, it comes with image stabilization too
- Manfroto "BeFree" travel tripod - still quite affordable, can be packed very compact with the ballhead its coming with, pretty lightweight even in the aluminium version already.
- Absolutely a Color Checker for precise colors; this is a cheap basic tool you shouldnt skip for model and product work (can be used for anything, of course, including landscape)
- [Circular] Polarizer (linear ones dont work with digital), an absolute musthave for landscapes; for example metal Hoya HMC filters are both affordable and already pretty much as good as the best, especially if you use Color Checker anyway
- Very likely a neutral density filter (10 stops) for tripod based landscape long exposures, namely for moving clouds and water.
- RAW processing software that can do high dynamic range, focus stacking, panorama series as well as Color Checker, lens corrections and post processing according to your wishes
- Obviously some studio space and setup for model and product photography work