There are plenty of form stacks available. Search the rapidweavercommunity.com site for one.
You will need another stack, however to place it in the sidebar. Try one of these:
While we’re on the subject of sidebars, I’d suggest not using one at all. You can create the same appearance by splitting most of the page into two uneven columns. That way you don’t need any tricks to place content.
@iMac1943 Have you dragged in a 2 column stack? Pretty obvious after that. Right in the inspector area it asks you how you want to split. Default is 50/50.