Hello there!
Registration and fee payment is a one time process in any State Quota Counselling. If you are not willing to opt for the choice filling round then, don't do it. You are required to fill the choices in round 2 and if you don't want to do the choice filling in round 2 also then, the amount paid by you will be reimbursed in your bank account.
For more information on expected colleges you can get on the basis of your NEET score, use this college predictor tool.
https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer
I hope this answer resolves your query.
Good Luck!
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