Exploration question from new player

Hi i just started playing the game a few days ago and am focusing on exploration. My current goal is to make a 20,000LY trip into the galactic core and return with the universal cartographics, i'm already about 2,000 ly out and was just wondering how much i might make from such a trip and what level of explorer it might get me to.

Any answers from more veteran players is highly appreciated, iv only made about 500,000 credits total and am at the rank of scout at this point so pretty green 😂