Cheeks and chin implant or rhinoplasty first?

This is an excellent question. Facial harmony and beauty depends on relative proportions of the features, not each feature in isolation. In other words, changing any one feature has an effect on overall facial harmony. Often a chin implant is done at the same time as a rhinoplasty. In terms of what should be done first, this is impossible to answer without seeing you in person, or at least seeing photographs to help give general guidelines. If your budget is really tight, keep in mind you also have nonsurgical options such as cheek augmentation with filler, chin augmentation with filler, and even non-surgical rhinoplasty.

It would be best if you address the dominant problem first; if it is your nose consider rhinoplasty or rhinoplasty with chin augmentation first. Once dominant problem is resolved you will see other "deformities" more clearly and make your next decision easier. Good luck.

It would really not make that much difference in which order you had a rhinoplasty, cheek augmentation and chin augmentation.  In my opinion, there is no clear advantage to doing one before the others.