For the image, make sure that align="left" is an attribute of the image tag. You can edit the text of the html module and switch to the html view to do that. The
Styling and formatting in the Text / HTML module tutorial will show you lots of other great tips and tricks. The
Styling and formatting (part 2) – Text / HTML module and FCKEditor tutorial show you even more.
For the other question, you can simply change the site skin to a more suitable one. All of your modules will still be on their pages. Some of the modules -- ones that were in panes that no longer exist -- will have migrated to other panes, but you can easily move the to where you want them to appear. You can rearrange modules using the "drag and drop" feature in DotNetNuke: in edit mode, click and hold the mouse on the module title until it is highlighted. Then you can drag the module to a new location.