Well,from the comments above about pvp gear/mounts , etc, you're going to need some money either or,mining seems pretty good,but unless you are a high level,you will not make much progress,at the mid-levels you can try mining in enclosed areas such as instances,to prevent any competition coming your way.The best class to do this with is with a rogue,stealth through all the mobs,if you get in a nutshell and just cannot control that agro,vanish.Deadmines is perfect for Copper/Tin,and chances of having silver spawns too, hope this helps. I plan on making a guide to mining on this site,when I do,check it out,it just might help,and about time resrictions,an hour or so is decent to powermine and get decent change in the process.In a good hour with powermining you could have an estimated 100 bars of copper/tin,and if the AH is just not doing it,offer in trade channel as a supplier with decent prices. Good luck with MM'ing