1- Talk to you accountant. If you dont have one get one.
2- Simple (but really annoying thing) - If you are waiting for your company phone number do not give your home phone number as the company number on any forms. A tesco £10 mobile will do (avoids constant marketing calls to the missus - 10 years later!).
3- Dont use your name in the company name - John Smith Dentistry (lots and lots of reasons).
4- You can buy an off the shelf (XYZ123 LTD) with a vague set of articles of association for maybe £70. Do you really need more than this? You can "trade as" whatever you want.
5- Do you have a relationship with a bank - but not your main personal bank? I would never ever have my mortage and company accounts in the same bank. Recommended by friends - repeatedly.
6- Go for it. A limited company has limited liability legally. Pay your VAT - always on time, pay your PAYE (maybe a bit late if you have to), never trust your bank totally. NEVER EVER agree a personal guarantee on a business loan. Ever.
I'll think of some more later!