1. Call up band directors to see if they need help.
2. Get a resume together outlining any experience.
3. Send out flyers to schools, music stores, etc.
4. Be willing to get paid little, none, or late (sometimes)
5. Use every opportunity to build your resume.
You have to be believe in yourself. Some band directors are turds to work with, not that drum instructors are not

so get ready for that sometimes. You must like working with young people also & watching them progress. Be very patient & loyal to your director's vision. Pray for doors to open also.