Hi sgdepuissance,
I am not a pro but I would like to offer some suggestion for your questions
1) Get some java moss or small java fern, as they do not require CO2 setup and they fair well under low-tech tank. Java moss are not that costly, around $2 per pack from LFS. $20 is a big NO NO!
2) Well just buy a pack of 5 shrimps (berried is good too) to kick-start your shrimp population will do.
3) I'm not a keeper of guppies or kuhli loach so I can't say much about it. As for other fishes, mosquito rasbora would be an ideal choice for a small tank. Remember since it is a small tank, do not overstock. Also make sure to finish cycling your tank before adding shrimp or fishes in to avoid casualties.
4) If you plan to anyhow mix shrimp species, you must make sure they are not from the same family group, if not cross-breeding will result in uglier shrimps. Hard to explain but you can read up on it.
Hope you find my suggestions useful
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