Sorry I didn't reply sooner, as you can see by my newly posted pictures the craftsmanship was not great but it is quite a sizeable structure.
I had the bricks/pavers lying around from the person I bought the house from.
I bought a brickey mate from seeing the adverts on tv channels and thought that would help, it did in a way I learnt the thickness of mortar which needs to go on each layer.
I used a ton of sand and 10 bags of concrete for the main part.(after the base was levelled) I would however suggest if like me in hindsight just to buy the ready mortar mix for brickwork - much easier right consistency- unless you know what you are doing.
1-I had levelled the site out first hard-core impacted down
2- I made a base with wood I then added mortar mix with hard-core and some steel rods to give it strength, then me and the wife levelled it as well as we could
3 - let it dry for 5 days
4- then I started to build up the courses of the walls.
Each part had their unique problems, I never used specific dimensions I just looked online to see how others did it, using YouTube videos
I will elaborate on each separately in my next posts, but well worth the work, as it will last years!