Upping calories, real scary.

Hi everyone,

I've put the same post on the group 'Eat More to Weigh Less' but I'd like to have as much insight as possible.

After a loooong time wondering if I should give it a try. I have decided to go for EMTWL way of life.
I'm scared to do it the wrong way considering that a) I'm not a number person and b) english only is my second language.

So here's my story and what I'm planning on to do. I'd be very grateful for any insight. Thanks in advance.

I'm female, 32 years old. 5.3ft, I work a desk job.
Regarding weight I've been up to 198lbs, about a year ago. I was 187lbs in January.
I joined MFP july 22 at 169lbs. Lost those pounds without exercising in some kind of 1200 calories a day, more or less.
I wasn't feeling much improvement, health wise. 'Just' got thinner.

From July 22th to October 18th, I've lost 13.5lbs. On 1200 calories a day for 1 month, then 1250. Doing water aerobics for 30 minutes once a week and 40 minutes walks 2 or 3 times a week. I've been staling for 4 weeks, gaining and losing the same 3lbs. Feeling deprived and real hungry the ultimate week.
That trigered a binge on October 18th, at night. I decided that wasn't right.

So, from last saturday (october 19th), weighing in at 157.3lbs after the binge (gained 2lbs no surprise) I went up to 1400 calories a day. So far, I've lost the binge calories and more (almost 3lbs the following two days) and gained back almost 2lbs in the last two days. Sticking (granted, only for 5 days...) to the new 1400 calories a day and eating back 50% of burned calories.

My goal weight is about 125-127lbs. I'm small framed but curvy.
Scooby calculator gives me a BMR of 1475 and a TDEE of 1770 (desk job with little exercice)

I plan on walking 40 minutes a day to go to work and start strengh training (New Rules of Lifting For Women is on its way, thanks to Amazon).

Since I don't know how accurate my TDEE is, I feel more confortable with eating 1400 calories a day + about 50% of burned calories (MFP counter, I don't own an HRM). But I might be wrong. Should I eat BMR + calories burned? Part of it?

I'm really lost but really trying to do the right thing, the right way. I've given all the information I could think of. Any advice, insight would be very welcomed.

Does my plan seems right, to start with?
What should I change, now or after?

I try not to freak out about the weight gain and focus on doing better in the long run.

Thanks in advance for ANY answer

Vanessa