I'm getting a personal trainer soon for mass-gaining and muscle-gaining. So here they are, whoever answers these thoroughly gets best answer…

1.) what are some questions they might ask me?

2.) how many sessions should I buy?

3.) Is it worth it?

4.) do you know any specific companies or any personal training facilities?

Thanks.

1. they will ask you why you want to get fit, and what you eat as well as taking some measurements.

2. as many as they reccommend you need

3. yes, it very useful to have somone push you.

4. no, it is better to get a personal trainer in private practice because in a corporation it is much more expensive.

The questions they will ask you will be what you are aiming to achieve, the experience you have of the gym already and probably the diet that you are on.

Only buy 1 or 2 sessions, see how you get on at first. You want someone who you feel comfortable with. and you should be asking them questions. You are paying for them. like what their past success with people has been.

Is it worth it? in my opinion, no. maybe if you are 400lbs of an obese mess and you are too lazy to motivate yourself and have money to burn. Then sure.
If you are smart enough to motivate yourself and browse the internet, sign up to forums, you'll get advice from people who actually do what they talk about.

Some personal trainers just get the grade in it, and it is all theory they have learnt about. they haven't actually gone through it themselves. I'd recommend a personal trainer who is or has been in the past a bodybuilder themselves.

I'd rather learn from someone who's been there rather than read about it in a book.

As for your final question, can't help you there due to being in different locations. You should ask at your local gyms. popular, really busy gyms are usually not for the serious though. Unless it's golds gym!