Where to start?

Ok, Been playing my warrior in PvE for 10 and 1/2 months. Wanting a break.
Interested in playing PvP. Which venue should I start with? Where can I learn PvP basics, a)Without hurting other players fun with my inexperience. b)Actually learn something. I know I'm not going to tear it up out of the gate. I will piss people off. But we were all new at first. I have been researching builds and such but am ready to put things to practice. To learn from doing. Any constructive suggestions? If this was the wrong place to post this question I apologize.

If you go to the Isle of the Nameless from the Great Temple of Balthzar, to the right there will be the Master of Paths. If you talk to him, he can take you to the training arenas (You + 3 henchmen vs. 4 henchmen). Or, you can go to Random Arenas. There are plenty of bad builds ran there so no one will expect to you to do well.

Random Arenas and the GWTv ("B" button) will be your best friends...
Look at the other player and read guides for warrior in PvP in différents Forums.

Gather all informations that you can gather and,..... practice and practice again !

Another good place to start are Competetive missions, Fort Amberwood and Jade Quarry. Take a look at pvxwiki.com, pick a build in the competetive mission section that takes your liking, then go play. There are pkeanty of people who have no idea what they are doing in these missions, so theres nothing wrong with another one.

OK great guys thanks alot i will try all those sugestions

Yes, start with those places. I wouldn't look at PvX though, just enter a match and see how things work. You will know if your build is working or not.