Hi, and welcome.
It's a long time ago now, but I also got into RL after watching a game by chance on TV, and have never regretted it. It's a great sport to watch on TV, and even better when you're at the ground.
From a neutral perspective, my recommendation would be Cas v Leeds, which is kind of thought of as a derby of sorts. I haven't been to one for a fair few years, but there was always a great atmosphere, and it's a chance to enjoy one of the last remaining old-style grounds seeing you've missed out on Central Park, Knowsley Road, the Boulevard, Wilderspool (although that was a bit shoite) etc. Cas fans will hopefully be able to say that it's still as good as I remember it!