It depends on if you are going for dramatics or contrasting expression. Think of commas as pauses, although pausing does not always work, in this case it does. Also, decide if the information is essential or non essential. You would use 2-commas to set off nonessential words and word groups example: The Dodge Caravan that is leaking break fluid is mine. = essential since if asked, which Dodge out of all others. Well, the one that is leaking break fluid. Next Dodge Caravans,which are roomy family vehicles, are spacious. = nonessential since we can take out(which are roomy family vehicles) and still complete the meaning. (Dodge Caravans are spacious.)
Here are a few comma rules not all but a few.
Most importantly think of the sentence structure that you are using is it a simple sentence, compound, complex, or compound-complex then recognizing the proper usage of a comma becomes "easy peesy"
Understand what a comma is - a punctuation mark that separates.
Use to separate a main clause from an introductory word or word groups.
To enclose or separate a nonessential word or groups that came within or after a main clause.
To separate two main clause, but do not forget the fan-boys or else you will have a run on or fused sentence.
Use commas to show series or a list
and in dates and addresses.
research the Oxford comma