Telika: I totally don't have the abilities for that. But I love browser-based rpgs, I have perused several (urban dead, shartak, cthulhu nation, and another fantasy based one I can't remember) and I had often toyed with ideas, mechanisms, settings, that I would alas be unable to implement.
So I totally say : go for it, and keep us informed. I can pretty much promise(-ish) to register at some point.
Why not sharing some ideas?
I like the "guild master" concept
kazmar suggested:
You have a guild of heroes. You hire them at the inn. Each day new heroes spawn and their level depends on the guild one.
You'll send out those heroes (arranged in parties) in quests that will give you money and xp. Each hero in the party gets xp and levels up and your guild as well.
You can buy equipment for your heroes too. Each day the shop will have new items to sell.
Your guild can be upgraded to increase max number of heroes, but also with, say, trainers that allow your heroes to get better (i.e., the cost of training is reduced).
Guilds could be grouped in alliances that would grant even more bonuses. Alliances could fight each other in wars.
This is the base concept.
Also, quests are automated -- you decide who to send and there's a timer that will tell you when the quest is done. There may be a fight at the end but you won't control it. You win if your heroes are strong enough.
This is my greatest concern -- how to make the heroes choice meaningful? Show the level of the enemy you'll front in the quest description? Have a difficulty meter?