For Example,if you have mice or rodents coming into your home or squirrels and birds in the attic, do they seal up areas that they may be coming in, or do I have to do that myself?

Any info will be appreciated.

Thanks in advance.

Depends on the company and the services you are paying for.

You will need to ask the exact company you are using,
Many of the companies merely catch or exterminate the pest, and will tell you what repairs need to be done.