I bought plain, white twisted nylon from a hardware store that was 1/4 inch thick. The first pack I bought was fifty feet, and I cut it into one thirty foot length and two ten foot lengths. The longer lengths was for body ties like chest harnesses, and the shorter ones for hands and feet. At that time I was tying simple things like spread-eagles and hands behind the back. Price was also a consideration, and I built up more rope over time.
I’ve since switched to natural fiber like hemp and jute, because it has more tooth and the knots and wraps hold better. I use thirty foot lengths, because I’ve also started tying more Japanese-style bondage. It’s the combination of rope and technique that I prefer, but I still have some of the nylon in case the person I’m tying doesn’t like the feel of hemp or has allergies.
I’ll agree that Two Knotty Boy’s videos and books are a good place to get starting ideas, and that safety is important too.
Hope this helps. Good luck and have fun!

I am curious to know what kind of rope did everyone first use? What material? How thick was it? Length? Color? What did you try doing? How did that work out for you?
I started with common marina and home supply rope, mostly 3/8 inch twisted nylon, though also some 1/2 inch. I bought a lot of 50 foot bags, some I cut to a variety of shorter lengths, others I left as-is. It was all white.

I did harnesses, tied wrists and ankles, spread-eagle, etc. I also used rope attached to leather wrist or ankle restraints. As I progressed, I realized I enjoyed the process of tying and untying my partner more, so I actually prefer doing things slower.

I find 3/8 is too big, and it results in knots which are too bulky

If you could recommend a first rope using those same details, what would you tell someone new to the art?
I recommend synthetic rope, for being easier to clean, doesn’t call for as much treating or maintenance, is stronger, and is significantly less expensive. That said, if you are drawn to natural fiber for whatever reason – smell, appearance, authenticity, photography, even popularity in your local rope groups – I’d say just get what you like.

I suggest people buy a spool of 500 feet, braided nylon, either 1/4 or 5/16 inch. Cut off a few pieces, and then you can adapt the length you like working with.

Have fun! 🙂

I use jute exclusively – I got mine from Jakara-Rope. It’s free UK delivery!