You don't want a gel seat cover. Despite what it seems like, saddles shouldn't be soft. You want the saddle to support your weight over the seat bones. It should be the saddle holds your butt so your legs can turn the pedal without friction. Softness like gel interferes with that.

If you are sore, try adjusting the saddle position. Start with the part you sit on being level. That works for the majority of riders. But expect some soreness until you get used to riding.

Good luck, don't do to much all at once, and enjoy the rides.