Take your time and follow your plan to sew a few at a time. As others have said, do not sew the halves of your hexagons together! You will find that the final joining of the lines goes quickly once you decide how they should be placed.
You may decide that there are certain hexagons that just don't go with what appears to me to be a primarily blue-green colourway. No rules here-- take them out and use them for something else (eg. applique them in a line to a strip of another fabric and make a table runner). If the resulting quilt is a bit smaller because of that, just add a complimentary border.
When you are arranging them on the design wall, make a pattern that you like, then leave it for a day or two. With a fresh look, you might see it in a different light. I agree with the quilters who said to make them all first, then start placing them on the design wall.
I think the hexagons that you have made so far are beautiful!