Soak them overnight in a salt brine. 5 parts water to 1 part salt. You can add stuff like pepper corns, fennel seeds and other stuff to give them a different flavor. I've even added chicken bullion! Just soak them in a bowl. After that, toast them in the oven about 250-275 for 10-15 minutes.
I recently purchased a small hand cranked oil press. Also purchased a packet of Sunflower called oilseed sunflower. I'll be processing my sunflower seeds to make hot fresh vegetable oil.