Thank you for getting back to me. I appreciate the suggestions and am currently outlining the tribe. From what I have so far, I went the semi-nomadic route.
The clan has a migration twice a year. The first of their calendar year is on the day of the Spring Equinox. It is at this point that the begin the migration to a forested field. The hunters and warriors of the tribe act both as an escort as well as the primary meat source. Once they get to their sacred grounds, they celebrate the Summer Solstice and live primarily on berries, deer, hares, and a few crops and breed the next stock of Desert Horses. Desert Horses are a special breed of horse bred by this specific tribe for the purposes of living and surviving in the deserts.
On the mark of the Autumnal Equinox, they migrate back into the deserts where they spend the Winter Solstice. During this time, they are a fully nomadic tribe, and use the resources they gathered during the Summer months to last them until the next migration. The hunters and warriors group together then assign various additional jobs. Some become foragers, others gather herbs, while some (like my character) mind the herd of Desert Horses they bred during the Summer Months. Once the Spring Equinox returns, they start all over again. The forested plain is somewhat difficult to find and are kept a secret outside of the tribe.
The best time to trade with this tribe is during the travel months. They allow free trade with any kingdom, thought it is up to individuals to bargain for the best prices. From herbs to spices to various furs and animal meats, different familial lines within the clan specialize in different trade arts. While profits and materials are shared, those whom are best suited are given priority to the best materials so as to benefit the clan during sales. My character's family is known for their strong and warm coats made of bear fur. She, along with her brother, hunts the bears in a carefully aggressive manner, one that her family spent years perfecting. She, as an individual, is known for her skill with a spear, as she can use the spear to strike clean killing blows then use the cuts as guides for skinning.
Their weapons are usually made with incredibly sharpened and beautifully worked stone. However, those that have proven themselves with a certain weapon may earn a metal version made with a special metal that is found deep in the deserts they travel. This metal is a deep obsidian color with swirling glimmers of silver and blue once worked. These weapons, are as effective in battle as they are beautiful, and would be one of the reasons few would voluntarily attack them. Few materials have been able to withstand a blow from the metal, but the metal is rare and dense, and must be worked while in the freezing cold of desert nights in the winter. Only one family in the clan can work the metal, and they refuse to sell the secrets to the outside world or non-clan members.
Outside of this, the clan is pretty free but will stand united against an enemy. While they have disagreements with a few other clans, they will not hesitate to stand with their sisters and brothers should a kingdom declare war on them. An attack against one clan...is an attack against all of them.