First off small bit of advice. Patience is a good thing. No need to post then one minute later post again because you didnt get a reply.
Now as far as placement of unit frames is very much personal preference. thats the general idea of customizing your UI in the first place is to suit your styles and ideas. As for frames you can check
HERE as there are many choices. If you want full customization without needing to know how to code then zero-kill gave an excellent suggestion. If you want something pre-configured then you many want to look in to oUF and one of its layouts. There are many more unit frames available aside from these 2 mentioned.
If you need some ideas for a layout to either copy or inspire you, you can check
Compilations & Suites or
this thread showcasing ideas and designs from lots of players. Keep in mind that not everything shown in the thread is currently available and indeed some of them were never released to the public as a download.