Lines 7-11 are as follows:

And all I ask is a windy day with the white clouds flying,
And the flung spray and the blown spume, and the sea-gulls crying.
I must down to the seas again, to the vagrant gypsy life,
To the gull’s way and the whale’s way where the wind’s like a whetted knife;
And all I ask is a merry yarn from a laughing fellow-rover

These lines tell us that the speaker longs to be on the seas and that he loves nature. He loves the ocean setting: the wind, the spray, the seagulls.

The speaker also loves wandering. He compares being on the sea to being a gypsy. Gypsies were known for traveling in caravans from place to place rather than having a settled home.

The lonely life of the sea doesn't bother the speaker at all because he so loves the ocean and even the harsh winds, sharp as a knife, but he does ask too for some company. He wants to be able to run into fellow seamen, especially a high-spirited one who can share cheerful stories with him.

In sum, the speaker enjoys being free and unencumbered, loves the ocean, and loves to travel and hear a good story.