It depends what you are using the weight lifting for. If you are using it for fat loss, you would eat at a slight deficit (about %10-%20 cut from TDEE) with the goal of going down in weight.

If you are trying to build muscle, from my understanding you would eat slightly above maintenance to feed your growing muscles.

Not sure what eating at maintenance does....lol. I'm really no expert, but it seems like you are already at a great weight so I'd be looking to reduce BF % and put on muscle which could result in weight gain, however it would be good weight gain.

Again, I'm no expert so maybe somebody else will provide some additional insight!

^^ yes.
My understanding is this: If you want to build muscle you have to eat above maintenance (at a slight surplus), and if you want to lose fat, you need to eat at a slight deficit. Like you, I'm basically at a healthy weight for my height as well--I could stand to lose a few pounds but I'd rather work on becoming leaner through weight training rather than just losing weight. So I try to eat at a slight deficit. When I am consistent, it seems to work. I don't gain or lose, but I get firmer and look better.

The title of your post is 'concerns about gaining weight' so I'm assuming you don't want to gain weight even if it's muscle weight. I feel the same way. When you lift, you'll probably weigh more than you'd like, but you'll look like you'll weigh less. This is why I don't weigh very often. I tend to get hung up on the number on the scale, and I think I'm 'too fat' even when I'm wearing my size 6 jeans, and I know I couldn't possibly be 'fat.' In order to get past that, I don't weight but rather go by how my clothes fit and use a measuring tape (sometimes).

I am also curious about what happens when you eat at maintenance. I don't remember the book addressing this necessarily. If you basically maintain at a deficit (you lose fat but your weight does not change), would you gain slowly on maintenance? Maybe a body builder-type will step in and lend some insight.

Just bumping in because I will be starting in a few weeks, but eating maintenance, so waiting for a comment on that

So If I'm trying to loose weight I'd eat below maintenance?

But by how much?

My concern about gaining weight is about whether or not I should expect it. If it is healthy to gain weight, then I want to know that. I'm still think of additional pounds on the scale as a negative thing, but if I should see the numbers rise with added muscle, then I need to know that number is actually a good result.

I guess, at the end of the day, I don't care if I gain or lose when I lift weights. I just want to know if I should expect to see one or the other given that I have no need to lose any more weight than I have.

Thanks for the advice though.

Yes, you should expect to gain a few pounds (I think the norm is 2-5 for most of us) in the beginning(the first few weeks) simply from water weight. You probably won't see a noticeable difference from actual muscle weight for several weeks or months. I am not saying this based on experience, just from what I have read. Try eating at your TDEE for the first month or two if you're not worried about losing. Go by how your clothes fit and take pictures to measure your progress.

Just new to this! How many calories does everyone eat per day?

Right now, I"m 5'2, 130 lbs and looking to lose fat/gain muscle. While at first MFP put me at 1,200 calories per day I now eat 1,500. The book's forumla put me at 1,949 calories for non-workout days and 2,192 for lifting days. I'm nervous to up my calories that much!

And I'm not concerned necessarily about if the scale goes up, but rather how I look/feel. For those who the scale DID go up--do you believe it was due to increased muscle mass, and not the increase in calories?

Thanks for the help!

I just saw this article posted in another forum, hope it's helpful, http://nextlevelpersonaltrainer.com/strength-training/figure-and-bikini-competitor-qa-initial-weight-gain-with-strength-training

Just new to this! How many calories does everyone eat per day?

Right now, I"m 5'2, 130 lbs and looking to lose fat/gain muscle. While at first MFP put me at 1,200 calories per day I now eat 1,500. The book's forumla put me at 1,949 calories for non-workout days and 2,192 for lifting days. I'm nervous to up my calories that much!

And I'm not concerned necessarily about if the scale goes up, but rather how I look/feel. For those who the scale DID go up--do you believe it was due to increased muscle mass, and not the increase in calories?

Thanks for the help!

http://scoobysworkshop.com/accurate-calorie-calculator/ I like to use this calculator for calories. It's pretty much the same as the book only you eat the same amount every day. I am currently trying to lose weight (still have a lot to lose), so I can't really speak for someone who has gone up in weight other than the initial water weight fluctuations starting back after a long break.
Take your measurements and progress pics, eat your protein, and make calorie changes slowly if you aren't happy with your results. Good luck!