When you ‘calibrate’ a monitor you are actually aiming to do several things.
The first being to set your monitor to a known standard for example white point D65, gamma 2.2 and luminosity 110 cd/m2 (will vary with editing conditions). The second being the creation of an ICC monitor profile that actually describes your monitors condition to enable colour savvy applications to display your image data correctly in spite of the fact that your monitor may be off from your required standards.
You cannot calibrate to sRGB or Adobe RGB as these are synthetic spaces.
The whole point of calibration is to enable you to view your images very close to how others will see them on their calibrated displays and in the case of sending to print (using the correct paper profile and soft proofing) that you get a very close screen and print match
Without any familiarity on my part with your monitor you should not be setting the limited sRGB gamut but using the monitors native gamut and adjusting as advised by your calibration software to get close to your required standards
Monitor brightness levels should be adjusted to enable a screen to print match and this will vary with the level of ambient light in your editing environment and may be somewhere in the region of 90 - 140 cd/m2 going from a dark environment to a much lighter. Take any recommended brightness settings with a large pinch of salt until you have proved such in a screen to print match
You may find it helpful to study the settings and recommendations shown on the Lagom site
LCD monitor test images
It is rare to find any monitor that will be close to the required brightness for your editing environment straight out of the box, most defaulting to far too high a level.