Feeling lost and don't know where to begin

I am a mom with 3 kids. Before I had my last child I was 230lbs. She just turned a year, and about 3 weeks ago I was down to 197. I am now 206. I bought a treadmill and started doing cardio at home because being a stay at home mom with 3 children doesn't allow the time, nor the finances to be able to attend a gym. I have searched for so many things to do. I was told that I need to get down closer to my ideal weight (165) before I start toning because i will build fat on top of my stomach and it will buldge. I started doing 25 min on a treadmill at 3mph/12% incline and noticed that I lose more calories doing so then running at 4.5 mph for 25 min. I just feel lost and don't know where to start. I have since gotten on the scale and now weigh 206. I started working out and doing dieting about a week ago when my weight went back to 200. I have since gained 6 lbs and I feel miserable. Does anyone have advice on supplements, and a good workout routine? Any hints?

Thanks so much!!

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