I need easy recipe for a beginner with chicken for a tangine used inside oven

This one can be prepared either in the oven at about 350F or on the stove top http://www.food52.com/recipes/15794_dawn_of_the_big_zombie_mustard_chicken_tagine_with_couscous

Be sure to brown the chicken first.

Here's a really great guide to getting started with the tagine itself :
http://www.thekitchn.com/tagines-what-are-they-how-to-c-148515

and a good, classic chicken tagine :
http://www.thekitchn.com/chicken-tagine-with-preserved-110807