I can't imagine having the capital or collateral to buy a practive right out of training.
Value of a medical practice is extremely difficult - much of it is, by nature "intangible" and what it is worth to the owner, may not be to you.
Speaking as someone who went solo from the start, I advise against it - unless you have owned a business before, been in the admin of a business or at least possess an MBA, don't do it. Better to spend some time working on learning how to practice medicine before you learn how much money you can lose buying and running you own business.