I agree with others in this. It took me over 3 years of steady progression to make GM in all tradeskills. It takes a lot of time and patience to make it. If you are doing it for fun, by all means go for it. If you want to do it to make stuff for youself and your alts, friends and guild, go for it. If you want to do it to make money, my suggestion is don't do it. You will spend way too much pps trying to get to the level to get much of the investment back.
That being said, good luck with your endevours. As a HIE Wiz, you should have high INT, which helps with all tradeskills. Make sure you read things at eqtraders.com to get a good idea on what to do. There are lot of things to learn, for example, you have higher chance to skill up on a success of a combine than a failure. So, it makes sense to try for combines closer to your skill level. Brewing, being the cheapest to GM, may only cost you a few hundred pps to get to 250. However, tailoring and smithing can cost you upward of 250kpp to GM. So, plan accordingly. Expect to do a LOT of farming. That's endless days for camping for mobs for a few points of skill ups. If you have the patience for it, kudos for you.
Anyways, good luck.
Taushar