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If it is just brown spots, then this is most likely fig rust, caused by a fungus. If you treat the plant with neem oil, it will correct the rust issue. Here is more information on both:
https://www.gardeningknowhow.com/edible/fruits/figs/figs-disease-rust.htm
https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm

This article should help: https://www.gardeningknowhow.com/edible/fruits/figs/figs-not-getting-ripe.htm

It may be a nitrogen/phosphorus imbalance in the soil. Too much nitrogen and too little phosphorus can result in little to no blooming, which means no fruit. This article should help: https://www.gardeningknowhow.com/edible/fruits/figs/fig-tree-is-producing-fruit.htm

This article will help with pruning: https://www.gardeningknowhow.com/edible/fruits/figs/pruning-fig-trees.htm

If you have yet to see fruiting, this article will help: https://www.gardeningknowhow.com/edible/fruits/figs/fig-tree-is-producing-fruit.htm

This article will help advise you with winterizing your tree: https://www.gardeningknowhow.com/edible/fruits/figs/fig-cold-protection.htm

I would repot the tree in late winter or early spring while the tree is still dormant, but you can repot figs at any time if you are careful.

As for the seeds, I would recommend doing a local search in your area to find any retailers or even mail-order catalogs. Your local garden center may also be able to help. You can also check out eBay. In my experience, eBay is actually a great place to find unusual plants/seeds. Just check the feedback on the seller before you buy.

A Brown Turkey Fig Tree will grow 15 to 25 feet tall and wide with a moderate growth rate.

https://www.gardeningknowhow.com/edible/fruits/figs/cold-hardy-fig-trees.htm