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lwc action buttons to open modal

I've got a custom request object and I'd like to create an action button with LWC that prompts the user to add a note and a file then posts the note and file to the chatter feed and changes the status of the record. I do not want to use Aura if possible. I'm not sure how to open a modal from an action button (something like the below)
<lightning-button label="Submit" slot="actions" onclick={handleSubmitClick}></lightning-button>
I'm not sure how to add an entry to the feed. Is this even possible with LWC?

Lastly, I'm not sure how to modify the record without using the lightning-record-form. Is Apex method the only option?