After the results are declared. All India counselling will start after 15 days and you'll be given 10-15 days to fill your college in order preferance wise. And after 5 days the  list of students who are allotted colleges in the first round will be updated on the official website of MCI.

In the middle of these 15 days State counselling will start and you have to fill choices in the form of your respective state within 5 days.

After the declaration of of result of All India first round in 2-3 days state will also declare its first round results. 

You will get 10-15 days to report at your respective allotted college seat. 

Withing 4-5 days the same process will be repeated for second round first for All India counselling followed by state counselling.

In the end All India mop up round will be there to fill the seats. Even after mop up if seats remain through All India counselling it will be transferred to state counselling. Atlast State mop up takes place where students are called one by one to one state college based on their merit and are given college of their choice based on availability.