Sandra;
       The right type and weight of the anchor is determined by where you sail and the bottom type. I had 3 rodes. 100'  +   150' +  and 300'  . Each had about 20' of 3/8th chain. This was for a 23' sailboat. I also had 3 anchors because I anchored in mud, sand and rocky bottoms. I recommend that you ask experienced folks in your local area for good info. Ask several people, as one person may have preferences that aren't valid.
       The 300' rode was for Lake Mead where coves could be 50' deep.

Have fun;  Sandy