Here are some pointers if you want to learn to build your own wheels.
Like Upper Class White Trash said, newer is better. Old spokes can stick, strip and they can be streatched unevenly. And a good straight rim is a lot easier to true. But I have spoked many wheels reusing old spokes.
Try spoking a front wheel first. It's easier and lighter to lace. I always remove the guts from rear hubs when lacing. Have a wheel that is already laced close by for reference if you start having brain cramps. And by the way, we use the Hugo code on here by crossing each spoke. The old wheel that you have probably doesn't have the spokes crossed. Must be some BMX or MTB influence of recent?
The OBJECT is to install all the nipples on the spokes with the same number of turns to start with. This insures that all the spokes are realitively the same length. This is where a lot people mess up by ending up with 36 different length spokes in their wheel. If all the spokes are realitively the same length, the hub should be close to being centered properly in the wheel. After you have laced up the wheel, put your wheel in a truing stand and starting at the valve hole, work all the way around the wheel tightening each nipple the same amount (one or two rounds)untill they start getting tight.
A bent wheel is a bent wheel. The fanciest truing stand made is not going to correct that situation. The truing stand I use is an old 26" balloon fork held in a vise. Have for years. Have owned professional grade truing stands. I still had rather use the fork because it is faster and just as accurate for me.
You need a good spoke wrench. My personal favorite is a Wald #74. I've never had much luck using a screwdriver to true a wheel.
Practice, Practice, Practice. This is a hands on learning experience. Reading a few paragraphs about spoking a wheel, although helpful, will not train you to spoke and true a wheel. It's kinda like learning to play a musical instument, but spoking a wheel is a lot easier than that.
Thanks!!!