You have a couple of lense to get you started. How serious are you about this and how much are you willing to spend? In your list the 30D is the best choice of camera bodies. If you are looking for the cheaper root then go with the rebel. For what you are wanting to do the following list would get you started with your existing lenses.
30D body $ 1,149.95
50mm 1.8 $ 79.95 (Portrait lens)
or
50mm 2.5 marco $ 239.95 (Macro & Portrait lens)
Canon EF 35-80mm 1:4-5.6 II (general walkaround len)
Canon EF 80-200 1:4,5-5.6 II (daylight action/sports lens)
If you are looking to get into this a little more seriously, there the following list would be a much better and more expensive. Sell your two lenses and use the money to help finance.
30D body $ 1,149.95
Canon 50mm 1.4 $ 309.95 (Portrait low light prime)
Canon 100mm 2.8 Macro (Macro and medium prime indoor action telephoto)
Canon 17-40 2.8 telephoto $ 1,149.95 or Tamron 17-50mm 2.8 telephoto $ 449.00 (great lens)
Canon 70-200mm 2.8 non IS $ 1,139.95
As you see it can start to get expensive quickly. You need to decide whether you are in a hurry for lots of stuff or better quality. If you are lucky you will able to afford both at the same time. You will endup finding that with macro you are going to need a good flash. Same with portrait at some point or lights. Good tripod, monopod for sports etc..etc..etc.. It is a never ending cycle. Good luck.
