Hopefully the logs will have been cut to a length that will fit in the stove.  If you need to split them you'll need a splitting maul.

Having trubs inserting an image but if you google "splitting maul" and select "images" there's loads.
You could try the Sol Debre co-operative or failing that Herraiz.  Can send directions if required.  If so, let me know which side of Tortosa you are.  Not teaching you to suck eggs but they're mean beasts and you could injure yourself if careless.  You should expect to pay in the order of €20 upwards.
There are also things called "wood grenades" that you hit with a sledge hammer.  Never tried them and not sure if you can get them here.
If you've got dosh to spare, there are various sizes of log splitting machines available.
You don't need to split down to the size of kindling and exprimenting will tell you how small you need to go.  Depending on the size of your rounds, try some halves and quarters.