Best way to lose certain aspects of the body?

well, weight on certain aspects of the body
haha
i dont want to lose anything specifically


i am going to be joining a gym soon, and i dont like my stomach (i want it flat, not necessarily very muscular)

and my thighs are just to large for the rest of my body

and i need to make my butt less flabby
hahaha

so how do i go about this?
what workout machines should i target most?
i have little endurance or tolarance for running because of an achilles tendon injury i sustained a few years ago

also i was wondering if anyone knew the bodyweight to height proportions for a 5'7.5" foot tall female
who weighs about 125 lbs
i know im not fat
but i dont think that figures are always necessarily accurate representations

As I was reading this, I kept thinking you had the same problems as me.
Then I read your weight --- if you're telling the truth...125 at nearly 5'8"? That's nearly underweight. I weigh about 155 according the scale today and even I am not overweight (or fat-looking for that matter).

Well there's no such thing as spot reducing; if you lose weight, it will come off everywhere (not just your butt or stomach or thighs, though with enough weight loss it WILL come off there too). I'd say try all the weight machines to tone up. But weight loss is not neccessary for you, I hope you know.

I do the stairmaster & run/walk on the treadmill and it works well for me.