Dear Rahul,

There is no problem after completing your first step you will get your provisional registration number. 

There is 5 steps in filling NEET Application form

1- Registering for NEET 2018

2- Filling Basic Details in NEET Application Form

3- Uploading the Documents

4- Making Payment

5- Printing Confirmation Page

To know in detail you can refer below link

How to fill NEET 2018 Application Form 

Good Luck!!