First thing is to get freshly ripe pine cones before they open and drop all their good seeds. That's when they turn from green to brown, typically in late September or October. Usually, that means picking the cones off the tree, not old cones off the ground.

If the cones you got last time had already been open for some time (e.g. old cones found on the ground), the only seeds left in will have been lightweight duds that didn't fall out.

When you get some fresh closed cones in the autumn, dry them out until they open, then shake the seeds out. Store the seeds cold over winter, and plant in the spring.

Resin

Yes!

We have big pine cones out now in summer and they are green. Are they good?

Let me give you a link. Cones from true pines take two years to mature. This is sort of important because not all cones are created equal and you want to make sure when you harvest them, they are really ready to be harvested.

Here is a link that might be useful: Wisconsin Natural Resources Magazine

"We have big pine cones out now in summer and they are green. Are they good?"

Not yet. They will be when they are ripe, in late September or October. Be patient!!

Resin