Here is one link to the Video :
[
www.youtube.com]
Length : Usually 10 meters. But varies little bit here and there (9.8 or 10.2 meters). After some practice and your style of tying, you will come to know how much length fits for you. After practice you will come to know if you need a little more extra length (increasing it to 10.2 or 10.5 etc...) or need to remove extra length (reducing it to 9.8 or 9.5 meters etc...) to complete the ladh. Also consider that cloth may shrink after some washing.
Dastar Length also depends on the Length of Keski you wear under your Dastar. If the Keski Length is more (approx 5 meters) then many Singhs prefer Dastar Length to be approx 5 - 8 meters. These all are matter of practice and preference. I don't wish to over-confuse you in all these details. You may go through the URLs pointed out by "gsingh jee" where other points related to Dastar Rehit has been discussed in details.
Width : From factory all the Dastar material comes with a standard width. Singhs usually buy Dastar of 10 meters in length and cut the Dastar into 2 from center of the standard factory width. After cutting you have 2 dastars of 10 meters each (with the width reduced to half).
Material : Full Voil is Good for beginners. Once you are experienced you will be able to tie any type of material, Half-Voil, Rubiya, Malmal etc...
Bhul Chuk Maaf.
Waheguru Ji Ka Khalsa,
Waheguru Ji Ki Fateh.
ਸਤਿਗੁਰਬਚਨਕਮਾਵਣੇਸਚਾਏਹੁਵੀਚਾਰੁ॥
