Normally an i-797 approval notice is not an entry document at all.

You can do either, but I would prefer to put the place you work.

The rule is that the medical must be signed no more than 60 days before you filed the application and it remains valid for no more than two years...

You can invite them to attend and they can apply for tourist visas to do so.

They can either buy a round trip or one way ticket to the U.S.

If you are seeking to be admitted as a visitor you may use your B1/B2. If you seek admission to attend school, use the F1.

If you have a work permit, you are allowed to work for any employer you wish, or to be self employed.

Check the application you filed and you will most likely find that you are eligible for employment authorization based on a pending I-485.

Correct, there is no need to file a 'bridge" application to stay in status with the F1 is pending.

I think your chances are excellent and you should do as your lawyers recommended.

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