Thats understandable! I wish that this range of plastic plants existed when I was a beginner!
I think you have made some sensible decisions.
As for your community, thats usually dictated by flow/decor/compatability/temperature/size (not neccessarily in that order! ;p ).
Your going to have a school of danios (you can mix leopards and zebras if you like).
These are fast, curious, sometimes boistrous fish that love to investigate! So best to pick tankmates that don't get grumpy!
As for the bottom, you may be tempted to get the little corydoras catfish (whichever species is available), if you do (or any other bottomdwelling loach/catfish really, you may whishto consider changing from gravel to sand or very fine pea gravel.
For mid range fish, the world is your oyster really! Platies are a good hardy choice, I would perhpas avoid guppies as (in my own experience) these never seem to last long with danios (I think all the swimming wheres them out!
Anyway, thats loads of random info, I look forward to your tank progressing!