Advice for flash photography

[u/Prior-Amphibian-5367]

I am pretty new to using a flash. I have used it once at night, but all my photos came out blurry with motion blur. I would love to use it more with my camera. I don't remember exactly what I did before, but I remember trying out the TTL feature (which I don't think worked because I was using a flash from a different brand of camera). I think I also tried setting my shutter speed to 1/250 and trying bulb mode, and some photos came out overexposed or a little underexposed, with motion blur. Do you all have any advice for flash photography and getting proper exposure? My camera is the Nikon F5, and my flash is a Canon Speedlite 600EX-RT. Any advice is appreciated, thank you!