i'm new as well, but i think the best course of action is to hatch
eggs and click in the union room. i believe more things will become
available the longer you play, so don't give up.
To get coins/Poke Dollars (PD) you can click, sell items at the GTS
(Global Trade Station)/Item market or pokemons at the AH (Auction
House), open mystery boxes (not every time).......
To lvl up pokemons, you have to wait that someone interacte with
it
To lvl up your trainer lvl, here is the
guide on the wiki page of PH (Poke Heroes)