Tribute
Tribute is a gift, and the choice to give it always belongs to the sub. Say what you expect, then let them show you how badly they want it. The site is for meeting and talking and never touches a tribute, so what is given, and how, stays between the two of you.
Tasks
Tasks keep a sub busy and focused: a morning check-in, a weekly spending report, a gift you pick out, a rule to keep for seven days. Make each one specific, give it a deadline and decide in advance what happens when one is missed.
Rules
Rules give the dynamic its shape: when a sub checks in, how they address you, what they may buy without asking first. Keep them few and clear, and enforce every one. This is a place to meet, not a shop, so leave price lists, adverts and links to other sites off your profile.
Limits
Say what you will never do: meet, call, show your face, whatever it is. A sub worth keeping respects it the first time. One who keeps asking is testing you, and you owe them nothing but the block button.