67tony, because spokes coming from the inside of the hub travel a slightly different length to a rim than those from the outside, it is normal for them to have a slightly different tightness if all the nipples has been screwed on the same amount. I use a tension meter when building wheels so I can't offer much advice on how to do it without one. However I can say that when I tighten the spokes to the right tension they are probably a bit tighter than a novice might think. If you have a properly built wheel you can ping or pluck their spokes to get the pitch and copy that sound on the wheel you are building. Of course the thickness and length of the spokes play a part in the sound. There starts to be pretty strong resistance when turning the spoke wrench as it comes up to the right tension. So much so that on some wheels, if they were not properly lubricated on both the spoke treads and rim, the spokes tend to twist (or wind up) as the nipple is turned.

I'm not a betting person but I'm going to guess that as you true your wheel, the probability that you ask some more questions will be pretty high.