The cones come out in autumn. look around the tree on the ground or see if any still are stuck to the tree.
If there are any catkins it is probably a Salix, and most probably Salix Caprea. Sometimes willows can look similar to alders before they form the more typical bark.
Both willows and alders split easily when green (most woods are easier to work green). After you have milled the timber (split through and remove the pit to reduce cracks), sticker it properly and cover the endgrain with PVA-glue and you will have some nice material to work with in a couple of years. If you have some larger straighter pieces you can also try to split it with a froe or an axe and some wedges. Riven material is even nicer, especially if it is straight. You can also try to carve some spoons, spatulas or such from the green wood. Both alder and willow are very nice to carve.