Hi, I can help with your questions! The first step with the body pieces is to sew (furry sides together) the darts of each body piece. Those are the v-shaped openings that—when you sew them together—will give the body shape at the shoulders and leg areas. The next step is to sew the two body pieces together, leaving an opening at the back for turning and stuffing.
To attach the ears, I would use a curved needle and a ladder stitch.
Post pictures when you finish, OK?