Infantry Team Leader is not an entry level position. In the military you must start from the bottom (or near it) and work your way up. To start it off you need to speak with a recruiter. Your recruiter will help you pick an MOS (Military Occupational Specialty), which is army jargon for job (Pick Infantry (11B)), setup mandatory tests, physicals, background checks, etc. You will take the ASVAB (Armed Services Vocational Aptitude Battery) before the recruiter can confirm your job choice. The higher the score, the more jobs that will be available to you. Don't get wrapped up about your score. I have met people with high scores that were idiots and people with low scores that were brilliant. After picking a job, taking the ASVAB, changing your job choice, if necessary, you will eventually get dates to go to MEPS (Military Entrance Processing Station). At MEPS you will take your physical, do a drug test, and, if all goes well, reconfirm your job choice and swear an oath of enlistment. You will then be given dates to report back to MEPS to leave for Basic Training and AIT (Advanced Individual Training), which is your job-specific training. Some MOS's, like Infantry, do Basic and AIT all in one. This program is called OSUT (One Station Unit Training). If you successfully complete Basic Training and AIT, or OSUT, you will then be given orders to report to your first Duty Station. Congratulations, you're now in the Army.
A couple hints/tips:
Do your research; do not take everything your recruiter says as gospel. You can find out almost anything about the Army and MOS's on the internet.
You are not a soldier until you complete Basic Training.
If you fail any of the major requisites, you can be "recycled" to one of a series of "waypoints" or possibly all the way back to the beginning, depending on why. If whatever the reason is bad enough, they may just send you home packing.
You will likely have a chance to take leave between graduation and reporting to your unit.
Work hard, be in the right place, at the right time, in the right uniform, act like an adult, be disciplined and respectful and you will be successful! The Army, much like any job, has it's bad times and it's good times, but it is an EXCELLENT stepping stone into the rest of your life. Good luck!