I was parked in a shopping car park police approached the car saw a small marijuana branch on back seat they arrested me

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This is likely to be a relatively minor charge, and you may even qualify for diversion if this is a first offence

You can attach documents, but delete the names

Are you charged with meth utensils and meth as well?

It isn't a jail matter probably and you can defend this on the argument you didn't know those items were in the car. If you provide evidence you just bought the car, and explain that you just did not know about the items, a judge may believe you-but there is a risk they may not. You may need to apply for legal aid if you are not working

You will not know exactly what the charges are until they give you the charging document. They may not bother charging you for the bag of weed for personal use

When you go to court or possibly before they will give you the charging documents with the actual charges

That document is required where they do not have a search warrant

If they have not finger printed you and taken your photo, it may be because they do not think this is too serious

They will do so, but may not have had time. If you talk to the police I am sure they will give you the correct documents like the charging documents before you go to court