question about building online game

Hi I recently been reading that thing about patents/copyright etc and wondering if you build a game/mmo from your own ideas and use no copyright stuff (e.g. own models, scripts etc) but you take inspiration from games (like the ability to create your own things-inspired by Sims home builder) but you twist it to your own purpose is that ok or will you get hit with legal issues at a later date.
Also if a game is free with an item shop (like most F2P online) do other companies have a claim it’s “theirs” and ask for -% of income

I’m asking as my game is going nicely and i think it might be one the 1% that might make it as a unity mmo game and dont want loose it soon as it is made

Copywrite - you can copy-write a photo of a tree, but not photo’s of trees.

Patent - difficult situation. If you get even moderately successful talk to a laywer.

There are a lot of ‘non-sense’ patents.

yer i noticed on that other thread about the lawsuit about patent and thats for the help