Visits: depends on care home. Ours has unlimited visiting but asks you to avoid meal times (which I'm hopeless at, but not a problem as Dad eats in his room). I visit him in his room, but some homes may insist visits are in the lounge. Other residents may be alarming (shouting and crying), try to screen them out, they're not your problem.
Your visits are mainly to let the home know that you're "on his case". You don't need to go and entertain him, just be around enough to keep a general eye on his welfare, and let them know he's a cherished family member, not an unwanted relative who has been dumped.
Get to recognise, and know the names, of as many staff as possible. Look out for opportunities to say "thank-you" - the staff in our home care about the residents and are very happy if you tell them your elder appreciated something they did - in our case, eg making him jam sandwiches for his tea.
Let staff know about the man he used to be. Photographs of him doing things as a younger man will help with this.
Give the home a written list of what they need to know to look after him - his food likes and dislikes, how he needs to be handled (eg let him stand up in his own time and not try to help him up), is he a an early or late riser by preference, does he like the bedclothes arranged in a certain way. They should incorporate this into his care plan.
Label everything with his name. And I mean everything.
No woollen clothes or anything needing special washing.
Things will go missing, so nothing too valuable, money wise or sentimentally. Scissors will probably be confiscated. Electrical goods (shaver, plug in radio) will probably need PA testing - I've learnt to simply put the new device into service in his room, and drop them an email to tell them they might want to PAT test (better than having it sat in the office for a week waiting for the handyman).
Everything will get juice spilled on it at some time. Laminate non-ephemeral pieces of paper.
You will probably shudder every time you go in, and think "I could not live like this". He will probably find it a lot more tolerable than you do.