Can someone please help me set up my 403B? My employer allows me to use a self-directed brokerage account and I’m a little overwhelmed.

Hey everyone!

I'm just looking for personal insights and opinions regarding the best 3-fund portfolio and index funds. Not sure where to really begin. Since this is my first real retirement account, I'm assuming consistent, passive, safe (enough) gains are what I'm after.

Thank you all very much.