Harriso

Hey there! I just bought a Lumix GX85, and while the body is FANTASTIC the good lenses are a bit out of the price range for a college student. A friend recommended I buy a mount converter and start my collection with older name brand lenses. Specifically hoping for manual lenses (I love the way they feel!), what should I be looking for? are there specific brands that'll give me the best luck/ones I should avoid? Other than KEH are there good websites to buy from? Are there any other general tips you have for someone starting out? Thank you so much! Harriso