You do not need to solve every lawn problem in the first weekend. A useful first month is about learning what is there, what has already been applied and which parts of the property need prompt attention.
Collect the missing history
Ask for the grass type, recent lawn-service records, irrigation instructions and any known drainage issues. Keep product names and application dates if available. Photograph the yard from repeatable viewpoints. Use “unknown” in your notes where necessary instead of filling gaps with a guess.
Choose three early checks
Measure the lawn, inspect irrigation while it runs and arrange an appropriate soil test. A laboratory’s directions tell you how to collect a useful sample; a quick meter reading is not the same as a fertility recommendation. Keep visibly different problem areas separate when the lab advises it.
Start a small care calendar
Use your state and grass guide to build a starting routine, then adjust it to the season and weather. Record mowing, water and any treatment in one place. For an unfamiliar weed or brown area, take a close photograph and investigate before buying a treatment. Choose a single improvement for the first growing season, so you can tell what helped.
An automatic multi-product subscription is not a substitute for knowing your lawn.