Received a notice of prosecution regarding careless driving

Hi all, I would like to receive some advice about what to expect.

Today I received a NIP whereby a driver had submitted footage of me pulling out on them at a roundabout causing them to stop.

I know this is careless and silly of me (and feel bad about it). I didn’t realise you could be penalised for this and obviously don’t make this a regular occurrence- it was a one off occasion whereby I misjudged how much time I had to pull out.

I have completed the initial form indicating it was me driving, however do you know the next steps?

For something like this- is it likely to go to court? Or will it be a fine once I receive my follow up letter?

For background information I have 0 previous points/driving offences.

I am incredibly worried and not sure if this is a big deal or something small- please help!