RN
Start with the thing most lists of this kind get wrong: the equipment is not the hard part, and buying more of it is the most common way people waste money in this hobby.
The order below reflects that. It runs from what genuinely matters to what is optional, rather than from cheapest to most expensive — and the first three items are not exciting.
Safety first, and this is not a formality
1. Safety shears. Blunt-nosed medical scissors that cut through rope, tape or clothing without cutting skin. If you own restraints of any kind, you own these, and they stay within reach of wherever you use them. This is the single most important item on the page and it is also the cheapest.
2. A first aid kit. Ordinary domestic kit. Minor scrapes and friction marks are routine; being unable to deal with one is not.
3. Good lighting you can control. Dim is atmospheric and useless for checking circulation, skin colour or whether a knot has shifted. Something adjustable rather than a single dim lamp.
The core equipment
4. Restraints with quick release. Cuffs with buckles or clips beat anything requiring a key under pressure. Padded, wide, and adjustable — width distributes pressure, which is what prevents nerve compression.
5. Rope, if you are going to learn it properly. Rope is a skill, not a purchase. Natural fibre for grip, synthetic for easier cleaning, longer lengths than you think. Do not buy rope intending to improvise; nerve damage from badly placed rope is real and takes months to resolve.
6. A blindfold. Removing sight amplifies everything else and costs almost nothing. Probably the highest ratio of effect to price in the whole category.
7. Something for the mouth — carefully. Anything that muffles speech removes verbal safewording, which means you need a non-verbal signal agreed in advance. A held object that gets dropped works well.
Impact, in a sensible order
8. Your hand. Free, infinitely controllable, and provides direct feedback on how hard you are actually hitting. Nobody should buy an implement before spending time here.
9. A flogger. Forgiving, distributes force across many strands, and the most beginner-tolerant implement there is.
10. A paddle. Broad, thuddy, easy to aim. Different sensation from a flogger and easier to control than anything thin.
11. A cane or crop — much later. Thin implements concentrate force into a small area, which is precisely what makes them harder to use safely. These are for people who already have accurate aim.
Furniture and positioning
12. Under-bed restraint straps. The cheapest way to make an ordinary bedroom work, and completely invisible when not in use.
13. A door anchor. Enables standing positions without dedicated furniture.
14. A wedge or cushion. Genuinely underrated. Position sustained for any length of time is a comfort problem, and comfort determines how long a scene can actually run.
15. A spreader bar. Simple, effective, and takes up almost no storage.
Sensation, which is where the variety is
16. Temperature. Ice, or low-temperature candles specifically made for the purpose. Ordinary candles burn at much higher temperatures and are not a substitute.
17. Texture. Feathers, fur, textured gloves, a pinwheel. Cheap, and combined with a blindfold they do more than most of the expensive items above.
18. Clamps with adjustable pressure. Adjustability is the whole point — fixed-tension clamps give you no control over intensity, and circulation time limits apply regardless.
What actually matters more than any of this
Three things, and they are free.
Negotiation beforehand. What is on the table, what is not, how to stop. Every time, not once at the beginning of a relationship.
A safeword, and a non-verbal alternative. The second one is the part people forget, and it is exactly the one you need when speech is restricted.
Aftercare. Intense experiences have a comedown, and it can arrive hours later. Warmth, water, and someone paying attention.
The honest summary
You could do almost everything worth doing with items 1, 6, 8, 12 and a conversation. The rest is variety, and variety only becomes useful once the fundamentals are automatic.
The equipment is the easy part to buy and the least important part to get right.