Start with the thing that brought the roofline to your attention. Maybe debris always settles where a downspout begins. Maybe one corner manages a light shower but spills during a heavy rain. Maybe the gutters are aging and you want to understand whether they are ready for protection. Each is a good reason to look closely before choosing a product.
During an inspection, point out the parts of the house you watch most often. Mention where water has spilled, which trees shed around the roof, and whether one gutter run seems to collect more debris than the others. Everyday observations help connect what you can see from the ground to the way the roof edge and drainage system are working.
It is useful to ask what the existing system needs before adding anything new. Are the gutters secure? Is water reaching each outlet? Does the downspout carry it far enough away? Is one section taking the brunt of debris from a valley or overhanging branch? Clear answers make it easier to weigh gutter protection on its real merits.
A good inspection should leave you with a practical plan, not a vague impression. You should know what was observed, which concerns are worth watching, and what next step is sensible. That may be gutter protection, a repair, a drainage adjustment, or simply a better understanding of the roofline you already have.