Welcome and as everyone else here, I think your weight loss so far is great! Don't let yourself get discouraged, keep reading and talking here on the forum as there are some great threads and some great people here.
I think the walking idea is perfect, and keep in mind that any extra movement is working toward your goal... consider doing leg lifts while you're sitting and watching TV or walking in place during the commercials of your favorite shows!
You can also just stand more often than you're used to- it's a start. Whatever you choose I hope it works well for you, and I wish you all the best of luck on your journey