Raised border bed

In my new refurbed front garden ( when it gets that far) I'm looking at putting in some raised borders, not very high just about 4-6" or so can anyone give me any tips, on building the raised border so it doesn't rot my new wooden fence to what plants to grow.
It's fairly shady around there for the most part, it's north facing and the garden currently grows wild roses, ivy, holly, various undetermined spiked shrubs and brambles lol
I'm after planting Rosemary and lavender among options but they're the only plants I know, I'd like a low maintenance garden

 

This is mine, maybe a bit higher than what you are looking at. The corners are bracketed and it's fixed into the ground by stakes. It's not made to touch any fences and the inside is partially lined with a damp proof membrane that drains out the bottom so it will last longer.
It was not a kit, we sourced everything from a builder's merchants.

 

The dug out part along the front is going to be a path.

 

Wow! That's beautiful, if I can get mine looking even nearly as good as yours I'll be chuffed to bits

 

There have been a few posts on raised beds recently.
This is my garden this morning:

 

Thanks - it improves as the season progresses.
It's taken a lot of hard work.
But am really pleased with it.