First, good for you for getting on this NOW instead of waiting until you have a lot more to lose. I wish I had taken it all more seriously when it was just 25-30 lbs. I did join WW at 140 years ago and got some odd looks from the much heavier and older ladies. Funny thing is I remember thinking at the time (in that arrogant way only a youngster can muster) that I was going to get on my weight issue before I ever got as fat as those ladies. Opps!
As for 'the best way', that's a subjective thing. I would tell you to learn everything you can about nutrition etc. and experiment with your body. IMO, the 'best way' is whatever fits well with your body type and is something you can do long term. In general, a ratio of 40% carbs/ 30 % fat/ 30% protein is considered a balanced diet. In your shoes, I'd strive to adjust my eating to those ratios then see if it's working and decide what needs to be tweeked.
Eating is 80% of the determining factor for success while exercise is 20%. Personally I find that exercising makes me more willing to do what I need to on the eating thing- it generates motivation so it's more than 20% in terms of importance to success for me.
I don't think you need to worry about your legs getting bigger due to running or any other exercise. That's one of those myths. Unless you are a genetic superior when it comes to muscle you just won't be able to build up bulky legs like a guy. Cardio is a must to burn fat and eventually you'll want to add weight training too.
1st goal- ONEDERLAND! Check!
2nd goal- Less than 194 (a number I've been stuck at before) CHECK!
3rd goal- Reach the 180's- haven't been there since 1999. CHECK!
4th goal- 180 which means hitting the 50 lbs. lost mark! Check!
5th goal- Switching to size goals now more than pounds goals. Goal is to make it to size 12, at whatever weight that happens. CHECK!
6th goal- Size 10! (can't even believe this is possible!)
7th goal- Size 8 and MAINTAIN!