Once the table layout is satisfactory, you can move on to formatting the text in the individual cells. You can apply manual formatting as with any other paragraph in the text, but it is highly recommended, for the sake of consistency and ease of maintenance, that you define your own paragraph and character styles.
Besides the paragraph and character styles, there are other aspects to consider when placing text in a table cell; such as text flow, alignment and orientation.
You can format each cell independently of other cells, or you can simultaneously format a group of cells by selecting them before applying the desired formatting.