Hi and welcome to 3FC. You've already made a start. You came here!!! A great, motivating, supportive and friendly place full of good advice and people.
As far as where to start other then that, well I think THE most important place is in the brain. Are you ready for this? Are you ready to work at losing weight? Are you ready to give up the high calorie/high quantity of food in order to GAIN a better, fitter, healthier and HAPPIER you. Once you make the DECISION to no longer be fat, I mean really, really make that DECISION, the rest falls into place.
I always thought that I wanted to be thin, well I did - I just wasn't willing to work at it. And then some 20 years later - I made that DECISION. I decided once and for all that I no longer wanted to live my life being miserable. Settling for second best, when first was WELL within my reach.
I started by emptying out my home of all junk. ALL. I set some very strict beginning rules. No junk at all - even in moderation at the beginning. I knew eventually I could have an indulgence every now and then, and I do, though rarely. If ever I go over my calories for the day - it's on the healtly stuff.
I stock my home with nutritious healthy foods. Tons of fresh vegetables. Lots of lean proteins like chicken breasts, fish, fat free yogurt. I start off my day with high fiber cereal and skim milk.
I count calories as that is a way for me to set limits for myself and be held accountable. Fitday.com is a good online calorie counter. I eat every 2 1/2 hours or so, so that I am never hungry. Good healthy foods that keep me satisfied. No garbage. The more garbage I ate - the more I wanted. I was pleasantly surprised that the cravings practically ceased when I completely elminated the junk.
I am also a huge believer in planning, planning and then planning some more. I NEED to kmow what's on the menu for the whole day and the week. It really keeps me on track. Much harder to veer off of a good plan.
I also added exercise into my life. Slowly at first. I think I walked 15 mins. 4 or 5x a week. And I slowly increased as I went along. Exercise is a MUST.
I also kept a journal and wrote in all the many reasons for wanting to lose weight. I would read it often and add to when I had cravings. It was and remains very valuable to me. I also keep a weekly log of my weigh-ins in there.
The first few weeks were tough. You MUST stick to it though NO MATTER WHAT. It does get loads easier as you start to see results, feel better and the cravings diminish.
I have lost 1 person and 1/2 practically. So trust me - it's doable. I don't miss any of the food - AT ALL. I have never, ever been happier. Or healthier. You CAN do this. WITHOUT A DOUBT. Losing the weight was the best DECISION I've ever made in my life. So, getting back to the original question and just to reiterate - that's where you start. By making the decision. I wish you tons and tons of good luck. I look forward to hearing from you and hearing about your progress.