Scape's not bad! What are you talking about hahaha. I really like those wood arch scape. Fertilisers will probably be neccesary with CO2 and reasonable lighting BTW.
Uhhh you just gotta get used to plant names, a lot of common names are close to useless and you start to learn and remember a lot of the binomial names after a while. If you can't remember something, or don't know what it is, Google is your best friend. I've learnt a lot by just being active in the forum, looking at stuff in my own time etc.. I'm surprised I have learnt so many, kinda wish I had the same ability for memorising school stuff.
But I digress, back to planting. I would not be adverse to stems, stems are you friend, they grow fast and can help you reach balance in your tank a bit quicker. At the back go for tall plants (obviously), either go for a bush of stems like Rotala or Ludwigia species or tapey plants. Some suggestion are Rotala rotundifolia, Rotala sp. 'Green' and Ludwigia arcuata. There are many more to choose from. Tapey plants, Cyperus helferi or Vallisneria species are good, great for the jungle look. Can't tell the dimensions of your tank so that would affect which background plants you use. Maybe have stems on one side and the tapey plants on the other. If you do that go tapey plants on the left, stems on the right.
Midground plants: Alternanthera reineckki 'Mini' is nice for colour
Pogostemon helferi is nice cus it's got funky leaf shapes
Anubias species and Bucephalandra are good to break foreground and midground, you can also attach them to the wood to accent them. You could also use these 2 genus of plants where the arch blocks light. As they can handle the low light.
Use Cryptocoryne species where the arch is blocking light, as a lot of plants won't be able to take it. Look at C. parva, there are a few others that would work there, but ain't coming to my mind now.
Foreground: Mixture of Staurogyne repens and Eleocharis acicularis 'Mini' would be my go for this tank, Maybe Glossostigma elatinoides instead of the E. acicularis 'Mini'.
Really there's many plants to choose from, have a look online on websites like Tropica or scapes you like and pick out plants you like and use those. The suggestions I gave are just a few to get you started really. Have fun with the binomial names, it's good to get started learning early

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In future, I also recommend getting all your plants before you fill your tank. Low plant load at the start and planting while it's wet can both be problems.
EDIT: And you thought your post was long... I tend to be extremely verbose. Sorry.
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