If you only have a single Universal Forwarder (UF) then you don't need deploymentclient.conf. Worry about that when you have multiple UFs to manage.
The outputs.conf file is provided by Splunk. Go to the "Universal Forwarder" app on your Splunk Cloud trial instance. Download the configuration file provided by the app and install it on the UF. Instructions are in the app.
The UF does come with inputs.conf, but it's not where the docs say it is. You can find the file in $SPLUNK_HOME/etc/system/default. DO NOT MODIFY ANY FILES IN THIS DIRECTORY. Instead, copy the stanza name and the settings you wish to change to $SPLUNK_HOME/etc/system/local and make your changes there.
--- If this reply helps you, Karma would be appreciated.