Rachel1010,
Welcome!! There is a lot of great advice. Please give it a year and don't be overwhelmed. Sell or donate plants and keep it in a fund for what you really want to have on your property.
As Community activist you are not alone when buying a house you had no clue had so much history. Look at it as a potential to learn! You have now done the research and it will take you some time to make it yours! Just sorry that the previous owner didn't leave you a detailed information to help you on our journey.
More folks should access City and County information before buying, real estate folks are there to just sell and have no clue on the history or what you will have to deal with, they only want the sell.
You are not alone!