Red oaks, like most species of oak, have acorns that are hydrophilic, meaning they won't tolerate drying out. They can be stored, but it requires maintaining humidity at a high level.
Frankly, the easiest way to grow oaks is to gather the acorns as soon as they fall and immediately plant them in the spots where you want the future trees to be. Plant 3 or 4 acorns in each spot, if more than one comes up you can always thin them later.
If you need to grow them in pots, it's still best to plant them immediately after they fall to the ground. Then put the pots in a shed or unheated garage and leave them (check every now and then to make sure the planting medium stays moist) until the tail end of winter, about now in this part of zone 5. Move them outside and wait for germination, it usually happens in late April/early May here.
Use the deepest pots you can manage. By the time the first leaves emerge for each seedling, its taproot will be down a foot or so. If the pots aren't deep enough, or the seedlings are left in them too long, their taproots will start to circle around the bottom of the pots. That creates a variety of negative consequences for the tree, some of which won't show up until years later. Many planted oak trees die young simply because they weren't treated properly when they were in pots.