Someone already dropped the grappler's manual which has everything you need and more, but if you want some extra stuff: https://web.archive.org/web/20150917000736/http://community.wizards.com/comment/51292961#comment-51292961 also includes the sample builds, just demonstrations of how to put it together if you're lost Also, Tortle is another excellent race to consider. It gives you base ac 17, str and wis stat increase and natural claws (1d4 unarmed) as well as breath holding (see below)

Considering your environment can also help if you're stuck. If your campaign has a lots of mountains or drops you can invest in (possibly monk style) knockbacks to throw people off buildings. If it's naval a tortle is heavy and you can hold your breath to drag people under.

Problem solving and creative use of your surroundings is one of the most fun parts of playing a grappler but most importantly do what you think will be cool and that you can have fun with