Any exercise including walking will help. However, caloric intake is the main attributor when losing/gaining weight. Macro nutrient types within your diet will play a big factor in the body type you're creating during the process.

Hi - I think that current science appears to show that healthy diets have a bit more impact on weight loss than does exercise... but that people who have lost much weight and kept it off for a long time cite walking as their #1 form of exercise to keep the weight off.

Here are two articles that might help. The first addresses walking specifically, and the second simply lists the CDC's exercise guidelines for all Americans. You'll see that the CDC recommends strength training at least twice per week. You might wish to add speed bursts or hills to your walks to achieve the "HIIT" effect that appears to help weight loss.
https://grokker.com/cooking/collection/healthy-nutrition/603ad327b356ab7d31b48ff0
https://www.cdc.gov/physicalactivity/basics/adults/index.htm

Here are three Grokker collections that might help. They contain walking workouts, general cardio workouts, strength workouts, and a little yoga. They also provide important nutritional guidelines. Best wishes!
https://grokker.com/fitness/collection/ellen-barrett-jane-fonda-denise-austin/603ad1c4b356ab7d31b48e73
https://grokker.com/cooking/collection/audio-walks-and-music/6032d7d96cd106116a9885f7
https://grokker.com/cooking/collection/healthy-nutrition/603ad327b356ab7d31b48ff0

P.S. Over time, you might find yourself walking often just for happiness, instead of for weight loss. Walking is a tremendous mood booster! :)