New to Keeper...what do I need to know?

Been doing fantasy for a while now, but never keeper. I’ve been good in redraft and going into year 2 of dynasty, I think I am in a position to contend for the next 2-3 years. But now I am getting into a keeper league. The settings are wild; a FULL 5 points for all passing yards. a FULL 3 points for all receiving and all rushing yards. We get to keep 1 each of QB/RB/WR and a Flex (which can be a TE). If you have any tips, especially drafting for this league, I am all ears and would be grateful!