yes, tripod is a must, the sturdy the better,
memory cards with large capacity,
fully charged camera battery
an intervalometer, you can find it in mass sale section,
you also need a software to compile the shots into video clip.
since most members have not done timelapse before, it is advisable to keep it simple, unlike normal shooting, you can't adjust framing, exposure setting, WB or focusing during the capture, you don't want spend ten twenty minutes shooting a few hundreds frames and realize the shots are not usable.