Weird Sounds Coming from transmission

I bought a 2018 brz (49k miles) off auction fixed it up and everything and learned how to drive stick pretty good in the past 2 weeks of owning it. I have a concern tho with the transmission first of there is a weird almost clunking sound coming from the transmission when shifting gears. No matter how slowly or smooth I try to shift there is almost always a clunking sound coming from the trans usually from first to second. Another thing I noticed is when I first start driving the car say in the morning for the first like 20 mins everything seems fine everything sound normal but after driving the car for awhile the trans starts making noises when switching gears or trying to put the car back into gear. Any feedback or advice would be awesome thanks.