First, don't hammer anything, yet.
Non-drive side looks like a sealed cartridge bearing. On the drive side you have a freewheel unit that screws on. You'll need to get that off before proceeding further I believe. The drive side bearing is located at the inboard side of the freewheel, which is why you are not seeing a seal.
Park Tool has a pretty good video on freewheel removal that helps you find the right tool for your particular freewheel.
Next steps depends on what you want to do, either re-grease or replace the bearings. Either way you can find YouTube video how-tos. Try this and this from Global Cycling Network.
If you you want to remove the seals on the cartridge bearings to re-grease, the seal can be very carefully prised off with a thin sharp object such as a box cutter blade.