Multi-Member LLC 2019 Tax Return Questions

I am preparing a 2019 tax return for a multi-member LLC, and have a few questions to be sure I am accounting and filing correctly.         

  1.   The LLC began in May 2019, but the member contributions started in 2017 before the LLC was formed.  The first tax filing is for 2019, so do I show those contributions in 2019?    If not, how do I show them?
  2.   One member made subsequent contributions later on, and I want to know if this affects the % membership for each member, or if that stays the same regardless of additional contributions.