401k advice and guide

Like the title says, just starting out with my first job and looking into setting up a 401k with up to 25% of contribution. After a bit of reading and deliberation, came up with the following diversification. I have a medium appetite for risk (I think?) but since have never done this before, looking for advice. Am I doing anything wrong? I’m very much a beginner in investing and would appreciate any and all advice. Please let me know. Thanks in advance!

1. Vanguard Target Retirement 2065: 50%
2. NTGI S&P500 (Probably NOSIX): 30%
3. Vanguard Extended market (VEMPX): 10%
4. NT ACWI EX-US index: 10%