RE: questions from a rookie (T-Hawk etc...)
Your radio may be fine after 10-15 years of storage if you didn't store it with batteries inside and it was in a good environment. Or it might be junk. The only way to tell is to test it. If it had rechargeable batteries, those would be useless by now, probably.
The T-Hawk receiver is 27 MHz, so it will not work with your 72 Mhz Tx. You would need to get a separate 72 Mhz receiver to put in the T-Hawk to use your radio.
But, buying the T-Hawk package without the bundled Tx/Rx only saves $30, so you will not be saving anything after buying a 72 Mhz receiver unless you already have one and it sounds like you don't. It's up to you, but you could go either way. You could just get the whole package and fly it that way for now. Then later when you get your next airplane, you can fly it with your 72MHz radio and let a friend fly your T-Hawk alongside you or you could pass it along or sell it as a package.
The T-Hawk comes with an AC/DC peak charger and that should meet your needs at least for a while. It won't handle Li-Pos that you will probably eventually get into, but you would have to invest in an expensive charger to get that capability and you would not need it for a while. And again, deleting the charger only saves $20 and you can't get anything else for the same money that would be as good.
Since the T-Hawk comes with 2 flight batteries, I would just stick with those to get started.
So you could save $60 by deleting the Tx, Rx, Charger and downgrading the batteries, but then you would have to buy all that stuff aftermarket (except Tx), and if you go the Li-Po route, you would be forking over a couple hundred dollars at least and then you would have to correct the airplane's center of gravity, too. And one good crash may toast an expensive receiver and Li-Po battery.
As for the training wing. It is pretty long. Be sure you can store and transport it easily. It wouldn't fit in my small car very well.
[Edit: on re-reading your post, it does sound like you already have a receiver (sorry, I missed that). In that case, order without Tx/Rx and it does not matter what band you order because that only applies to the Tx/Rx combination. This assumes that your Tx/Rx are still working properly. Since you already have the radio gear, you could also get any number of ARF packages such as the EasyStar]