Many thanks Ray for all your support.
I think I understand how some of the factors involved now.
So my my own reference and anyone else if they with I put together a guide which at least will assist me in future.
With your permission it is below if it need changing etc please let me know.
To create a Responsive Page using Web Assist Server Behaviour, Repeat Region.
In Dreamweaver create a new Fluid Grid Layout file and set preferences required.
This creates <div class="gridContainer clearfix"> where other divs can be created.
Create a recordset which will open the required rows in a database table or query.
Create a new100% wide div inside "gridContainer clearfix"
Within the 100% wide div.
Place a new div which is say 3 columns wide.
From the created recordset drag in to the small div a suitable field eg RecID.
To insert an image
From the toolbar
Select Insert - Image and a Select Image Source box will appear.
From the "Look In" box drop down navigate to the folder where images are found and note the url path to the Images folder. This will be required later.
Set DW page view to Split
Now in the Select Image Source box click Data Sources and select the recordset created earlier.
Select the image fieldname and OK. Enter Alternate Text if Required.
In the code view you will see line of code inserted.
Looking in the source code you will notice the code (or similar has been created)
<img src="<?php echo $row_rsPrimeImage['Image1_250']; ?>">
It is missing the image location which we looked at earlier. The image location was "boatimages"
To cause the code to find the image ammend the code to:
<img src="../boatimages/<?php echo $row_rsPrimeImage['Image1_250']; ?>">
Run the page to check all is working