There are a few different ways that you can check your draw length. One way is to measure from the nock point (the point where the arrow attaches to the string) to the center of the bow grip. Another way is to measure from the front of the bow (where the arrow would rest when not drawn) to the back of the bow (where your hand would go when drawing). You can also use a tape measure or ruler to measure from one end of thebowstringtothe other. The most accurate way to check your draw length is to have someone else do it for you while you are holding the bow in a shooting position.
Draw length is important because it affects things like accuracy and arrow speed. A longer draw length will result in more power being transferred to the arrow, which means it will fly faster and further. A shorter draw length will result in less power being transferred, but it will be easier to control. There are some general guidelines that you can follow when choosing a draw length, but ultimately it comes down to personal preference and what feels comfortable for you.