Welcome! You have taken a good step to consider buying an already working b & b since the owners can train you and give you advise. I am helping to run my grandparents inn. My uncle is always ready to help us out when we ask, but don't expect him to do the work! Make sure you get contact information for prior owners if anything comes up.
Eleven rooms is too much for you alone so yes, I would look into keeping the housekeepers they already have, if they do. If not you can advertise on indeed.com. For wages ask the owners or check out ads for housekeepers. I would say they must have housekeeping experience since this is all new to you.
I would check out their web present. Is the website modern? What is their reviews like? The complaints, are they about breakfasts, hosts, etc? If its about the rooms, beds, baths, etc., know that you will have to do remodeling and that cost money! What are their add ons? Are you comfortable with continuing them?
Is it up to code or are they selling so they don't have to do the new code stuff? What will come with the business? house and property? furniture and how much? website? OTAs listings? etc...
What do you mean by second career? Will you be working another job? Guests are usually Thursday-Sunday. If you have another job will this interfere with it? If this is your only job does last year records show that it will make enough to support you, taxes, and the bills?