Here is a link to some good guides you may be interested in:
http://www.xs4all.nl/%7Ebrt/wow/index.html
As to whether or not to switch out your professions in the first place, that’s a decision only you can make. But if there’s one thing I’ve never been short of its opinions. *smiles*
If your goal is to make money while you level your best choice are two gathering professions. So based upon that criteria I’d say you should stick with what you have. Or possibly switch out herbalism for mining if you really don’t like to mine.
I can understand how you can find farming for resources boring. However, if you take up a production profession you’ll still be farming for resources in order to craft those items. Or else you’ll be buying resources off the auction house to make them. And to be honest, unless you can find a nitch market on your server, you’re not likely to make much money with a production profession until you acquire the harder to find patterns, formula…
Engineering if a fun profession. You can make and use all kinds of explosives, fun toys and useful items like underwater breathing helms. But as most engineering items require engineering to use, there is a very small variety of items you can sell to the general gaming public. It’s a fun profession but its not known for bringing in cart loads of money.
Enchanting can bring in some big bucks, but getting to that point requires a lot of reputation farming and/or high end instance running. And enchanting can bleed your bank account dry as you try to level it up high enough to have enchants people are willing to pay money for. You can’t sell your enchants on the AH and there are generally dozens of enchanters on at any given time trying to sell their enchants.
I would suggest sticking with gathering professions until you hit the level cap. At that point you should be able to farm enough areas that leveling a production profession isn’t as much of a hardship. I only suggest production professions for characters leveling up if you actually enjoy production professions. There are a lot of us that simply enjoy making things.
Best of luck with whatever you decide to do.