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When we submit a suitelet with a checkbox inside the suitelet form, can we send a value along that check box to the request?

Not sure what you mean by send a value along?  The value of the checkbox can be read in the POST, it on the `context.request.parameters`

If not possible how can we send an object to the post request?

Also what's checkboxFieldId_send property in the request object which is empty can we set this?

If you want to send text then you need a field to hold the text, which would also be in the parameters

you could also consider using a radio field type instead of checkbox which would allow you to set a label and value for each option.