AE basics: Go to Window>Character or select Workspace>Text
In the timeline, select the Text Layer or in the Comp Panel, with the text tool selected and the layer selected in the timeline, highlight the text you want to change
In the Character Panel, Change the font attributes...
Take a quick look at this short video. You will learn how to find the font panel, change the paragraph style and baseline shift:
Please, since your question tells me you are very new to After Effects start here: Basic Workflow