The usual SOTA exchange is callsign and summit reference. Names and signal reports are nice but not technically part of a SOTA log. Be sure to also record the UTC time of each QSO you have as you will need this later when logging.
If you want to log your contacts on the SOTA website and actually score points then you will need an account on the SOTA Data website first. Remember that to activate the hill you just need one QSO, but to score points (qualify) you will need four QSOs with different stations.
Options to submit the log are on the left-hand side under Uploads
Be sure to log the following:
Double check your log is accurate before submitting, otherwise you’ll need to resubmit the entire log with the correct entry replaced.
A good app to use on your phone is Portable Logger
Import/Export options for logging are available on the website.
Here is a link for a CSV to ADIF log converter for SOTA use: https://www.on6zq.be/w/index.php/SOTA/SOTA2ADIF
And one to go the other way: https://www.on6zq.be/w/index.php/SOTA/ADIF2SOTA