I know I’m supposed to be investing. How do I start?

On the Money is a monthly advice column. If you want advice on spending, saving, or investing — or any of the complicated emotions that may come up as you prepare to make big financial decisions — you can submit your question on this form. Here, we answer two questions asked by Vox readers, which have been edited and condensed.I’m currently 27 and am fortunate enough to still live at home…