Hi Karen,
Hooray! A zentangle newbie! I am surprised more members aren't zentangle fans. Zentangles are really fun and were created by Maria Thomas and her partner Rick Roberts. Maria is the calligrapher who inspired me to learn pointed pen calligraphy.
It is meditative in its own practice. I have a theory about why but it is very heavy and definitely goes off topic!
In any event, there are many wonderful resources now available.
Zentangle.com Zenspirations I think Joanne's sight is SO inspirational!
There are also a ton of books and great classes available by CZTs (Certified Zentangle Teachers).
I have one of Joanne's books linked on the home page for the forum. I'll add some of the other ones I have enjoyed!
Have fun! I worn you though - it is as addicting as Calligraphy!