Try using as many layers of text as you will use.
Put text
You can add text by selecting Text from the Insert menu in the toolbar (or pressing the T key). The pointer will change to a Text tool icon, and you can place a text layer by clicking anywhere on the canvas. If you just click, the text box will be adjusted to fit the font size, and if you drag while holding the click, you can adjust the text box to the size you want.
text style
When you select text, you can set various options in the Inspector on the right. You can adjust the size and color of the font, and set the spacing or alignment of text lines.
between lines, between letters
You can select the text layer and adjust the leading and tracking in the inspector on the right.
Sort
You can align text horizontally and vertically in Sketch. To see changes to the alignment of your text layer, you can set the text box to Auto or Fixed.
If you set the text box alignment to automatic, the text box will automatically expand as you type it. When the alignment is fixed, the horizontal and vertical sizes are fixed like a layer, and the size is fixed even when text is entered.