For a one-off project, you would click to create a one-off project, then select the timing, create your design, and add recipients in the editor.
For a recurring campaign, it is essentially the same process, but the timing options are different, and you would create a list in the Contacts section to which the campaign will be sent.
Drip campaigns are like multiple one-off projects strung together that you send to a dynamic list.
Advanced orders can be either integration orders or API orders. Both of those require a template.