If you can't see InDesign's Baseline Grid there are a number of possible reasons why. The first thing to check is whether you've asked for them to be visible: check that View>Grids & Guides displays Show Baseline Grid.
If the grid is still not showing, the next thing to check is that you're not currently in Preview Mode, (useView>Screen Mode>Normal) as that will hide anything that won't print, including the Baseline Grid.
If the grid is still not showing, then zoom in, and eventually it should appear. This is because by default it won't display if you are viewing your page at less than 75% magnification. If you have a small screen you might want to change InDesign's preferences so that the grid will appear when you're looking at the whole page. To do this, choose InDesign>Preferences>Grids (Edit>Preferences>Grids on PC) and lower the View Threshold value to around 50%.
Why can't I select my text? Why has the baseline grid ruined my text? How do I make the most of InDesign's many text options? If you've ever asked any of these types of questions, our mini pdf guide to InDesign text issues is written for you. Find the answers to these questions and half a dozen more.