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I meant sheet behind a waterproof membrane but I get your point. I'm pretty practical but have never tackled bricklaying, so this seems like a good project to give it a go on seeing as it'll be hidden!
Trunkie-
It can't be difficult, I can do it. If I remember right, you're looking at 60cm, in which case 2 blocks high by 2 blocks wide with a brick capping won't be far off (see below but blocks not bricks to front). Ideally, lay your foundation 2" overwidth and about 4" deep and dead flat. Alternatively, if you follow the ground level, cut bottom blocks to angle of foundation with a grinder and diamond blade, top of the bottom course must be level.
ColinTheBald
What #Bobbo said re Type 1, use concrete for brick or block.
You might as well use cardboard as use sheet timber for retaining soil, it will last as long. This is why you don't want soil against your fence in the first place!