Just select Quicksync, set the settings to 1080p 60FPS, select the path for your recording (preferably a fast HDD or SSD, in case of an HDD - better select a drive without windows or any used programms so your recording will not slow down the drive that is used for all your other stuff). 120GB SSD is too small for recordings, even if you have half of the space for it.
Bitrate - try something from 35000 to 50000. That will give you decent quality for editing, even for zooming into the recording and then you can bring it down for uploading, when you have finished your editing job.
Thats for recording, make a separate profile in OBS and just name it recording.
For streaming to youtube, you want x264 (because it will look way better at a lower bitrate that is suitable for streaming).
We dont know your upload speed, so the general recomendation is: 3500 bitrate, CBR or, custom bitrate: off, CBR padding: on, preset: Veryfast. If you expirience a heavy CPU load, fall back to 30FPS or fall back to 720p 60FPS. Dropping the preset to the fastest (ultrafast) will also reduce the CPU load but decrease the quality. If your upload is decent (15+ mbit/s) you can go higher, youtube can take it. Bitrate will affect quality more than anything else, so if you can - increase the quality by increasing the bitrate first.
If you end up on twitch.tv - 3500kbps is max. bitrate for streaming to that service.
For more useful tips we need more infos (what do you stream, low impact games like LOL or tripleA titles, your upload speed, CPU OC if avaliable, stuff that you run next to the stream etc).
In general: create multiple profiles with different settings.
Use x264 for streaming and Quicksync or NVenc for recording..