Congratulations on the purchase..
From the Maptech chart of the area, the following have either transient moorings or slips, and are right by the entrance to the Cape Cod Canal.
Onset Town Pier 508-295-8160
Stonebridge Marina 508-295-8003*
Point Independence YC 508-295-3972**
Onset Bay Marina 508-273-0357**
Maco's 508-759-9836*
Bourne Marina 508-759-2512**
Onset Town Pier has no fuel facilities whatsoever. The ones with ** have both gas and diesel at their fuel docks according to the chart, the ones with * only have gas.
My recommendation would be to use one of the two I've italicized, since I think they'll be easier to get to, and are more sheltered than the last two wil be. The first four marinas I've listed have both moorings and slips and are located in Onset Bay. TThe last two only have slips and are located closer to the canal entrance, but face southwest, which is often the prevailing wind in BB.
I'm down in the New Bedford part of Buzzards Bay, and would normally recommend something there, but that would be a bit far from the Canal entrance.
Be very aware of the tidal current at the mouth of the Cape Cod Canal, as if the wind is blowing from the SW and the current is ebbing, you'll get some really nasty waves right there. BTW, the westward ebb tidal current in the canal is about
4.5 knots. The eastward ebb tidal current is about
4 knots. It is best to go in the canal with the tide or on slack tide, depending on the wind direction.
The Cape Cod Canal Control operates on VHF 12 & 14. The bridge at the west end only has a 7' clearance when closed, and a blue light warning boats approaching with the current.
I hope this helps..
any questions, let me know.