Talk to your colleagues. Visit other schools in your district. Some districts will allow you a visitation day to visit other schools. Don't be afraid to ask a colleague if you can use or reproduce something you think you can use. Also, if someone has shared a great lesson or worksheet with you, share an idea or great worksheet you have created with them.
All teachers can profit from new ideas, no matter how long they've been teaching.
Also, please remember, don't try to do everything your first year. You also need to stay healthy and get plenty of rest. Another resource often overlooked are your students' parents. I got started in problem solving thanks of a parent who volunteered to share puzzles with me every week. Parents can share their career experiences as guest speakers and they can help volunteer in your classroom.