Intonation is based on the adjustment of the string saddles at the bridge, it doesn't change without turning the screws. When you take all of the strings off, the tension rod will bend the neck back, but it will also return once you have the strings on, as long as you play them a bit to break them in and tune it, it isn't a problem - don't leave strings off for longer than necessary, but taking all of them off and cleaning the neck well is good guitar maintenance, and a clean neck plays much better than a dirty neck.
For winding the strings, I usually just wrap them around 3 times below the hole in the tuning peg, though I have read a guide saying to wrap it above once (I believe it was a Gibson owners manual). Wrapping the strings around less isn't bad, they are more likely to go out of tune, but nothing serious. I have pulled strings straight through the holes and turned the peg until they were in tune, not even a single wrap, and they worked out fine, maybe not staying in tune quite as well as those put on carefully, but it didn't hurt the playability. Wrapping strings around too many times isn't good, because it makes it harder to wind them cleanly, and I find that when they wrap on top of themselves, the tuning pegs resistance varies based on the odd wraps, which sometimes makes it a bit harder to tune - nothing major, but a good habit to be in.
Not sure if I am misunderstanding this.... but.....
Quote (Pingers @ Apr 16 2010 02:32am)
also i dont wanna give too much lack, then i have too much string..
If you mean slack/tension in the string, don't worry - how the string is wrapped beyond the nut does not affect the tension/playability of the string - the tone (note) produced by any given piece of metal (the string) is based entirely off of the amount of tension on it, so as long as it's in tune, any string manufactured to the same specs will have the same amount of slack.
Finally, don't use cheap strings! A good set of strings only costs $5-8 or so, and finding strings that you like is a step into the wonderful world of tone-seeking - try different notable brands, especially if you use a standard-sized set, and note the differences. Try SIT strings too, I found them after not quite being satisfied with the strings in all the local stores, so I mail-ordered some and I love them all around.