Get the boat going as fast as you can as quickly as you can. It can take several seconds to accelerate a boat to full speed when going to windward. Sail faster as you approach the line by aiming 10 degrees or so off the wind, provided that you have room to leeward. A starts fastest.
If the start line is not quite at right angles to the wind then one end of the starting line will be further upwind than the other and therefore nearer to the first buoy. The line is said to be biased. Sail along the line in both