Minecraft server permissions to step on pressure plate

I would suggest you to download and configure the following bukkit plugins:

• Permissions. Allows you to set up groups and commands for other users.
• Essentials. Gives you /item, /spawn, /tp, /home, /warp, /time and much more.
• iConomy. Sets up an currency system. Also gives you the possibility to withdraw and insert "Eura" (as the currency is called) into a users account.

There is also a full list of server mods/plugins.

With a quick search on the Bukkit forums, I found the plugin LocalShop, that seems like what you asked for about shops.

As for the "teleport to others homes" part, I'm still looking for something myself. But I guess the best thing is to ask the Essentials creator to implement this.

I also advice you to install HeroChat, as it's a pretty good chat plugin, and BigBrother as it's a very good system to help fix griefing.

Plugins are usually installed by placing them in the /plugins folder, but some plugins also have custom installation steps, and these steps are usually detailed in the forum post.

Try opening the map with some map editor (mcedit) and see if you can see any of your old constructions or not. If you can't, you've lost everything (data loss, probably).

If you can, you might want to set the spawn location to where it originally was. I've seen a couple of scenarios where there was some data loss and the spawn point changed, but the mapped remained the same.