Follow the training videos that 3DR put out if you're new to the Solo. If you have any trouble installing gimbal and getting smooth video, there is a thread here that will help fix those issues. HDMI cable needs to be routed properly and props need to be balanced. Assuming you have a GoPro, check the threads on firmware 3.0 vs 4. There was some loss of functionality with the upgrade of GoPro firmware to 4 so you might not want to do that. I'm using another range extender from FPVLR -
FPVLR 3DR Solo Long Range Antenna Upgrade V.2 10.5DBI. I've got several Solos thanks to some of these 'deals', they all fly fine. I am going to replace my HDMI cable with one from Relish 3D and I've already balanced the props I use. Good luck with the new drone.