You won't have your ideas readily accepted until you demonstrate competence and good judgment on the job. The process will take time. Try to find at least one mentor. A mentor should be a senior co-worker with whom you feel comfortable and can go to with concems or problems. Don't be too aggressive in looking for a mentor relationship.
Studies indicate it is usually the mentor who initiates the relationship.
You can help the process along by occasionally seeking advice from senior co-workers and seeing what relationships develop. Your supervisor is a good place to start. Chances are he or she played a major role in hiring you and has an interest in seeing you succeed. As you get to know your co-workers, you can gradually detemline which ones will be helpful and respect your confidences. Develop good interpersonal relationships with your co-workers.