According to the specifics on Samsung website, you can't upgrade RAM so easy because is LPDDR3 on soldered onboard.
As for the hard drive, it's got eMMC so that means is also soldered to the board.
Conclusion:
1. To make it faster, you can upgrade RAM only if you have experience into desoldering/ soldering this stuff.
2. To increse storage, you can upgrade the eMMC - same you need experience. But you can skip this and just get a C-port flash drive to increse you storage.