Store wild boar spareribs in your freezer until you're ready to cook them.
For thawing tips, read Safely Defrosting Food for Maximum Flavor.
Wild Boar ribs cook similarly to regular pork ribs. However, their meat is comparatively lean, so it is a particularly good candidate for brining if you're going to roast them (how to brine meat).
BBQ sauces and rubs meant for conventional pork will work, but the nuanced, sweet nutty taste of wild boar also opens other possibilities commonly used when cooking game meats. Wild boar meat pairs well with rich, fruity flavors like red wine, prunes, brandy, and apples. Herbs and spices frequently used with wild boar include rosemary, thyme, and the always game meat friendly juniper berries.