For a patrol detachment, you must include one HQ (e.g. a captain, lieutenant or librarian) and one troop unit (your already bought tactical squad).
After that you may include a limited amount of elite, fast attack and heavy support units (I'm not certain on the amount, but you have at least one slot of each).
So all you are missing is a HQ unit and you can use your Dreadnought as one of the optional elite units.
EDIT: 10 tactical Marines currently cost 180 points, and a Contemptor costs around 140 to 210 points depending on equipment. So you have enough points left over for a decent HQ character and maybe even a second. Feel free to PM me for some more detailed advice, I'm not a pro but small scale games are what I'm interested the most in so I have some experience.
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