Hello and welcome to TFF.
Your looking into and researching beforehand is wise and will likely make your venture into fish better.
Before you cycle, get fish etc., the first thing to do us learn what the tank water and tap water (source of new water for water changes) parameters are. Get a good test kit like the API and test for pH, GH, and KH. The last two are not included in the Master Kit and so you’ll need to buy the GH and KH test kits separately in addition. The other tests are for ammonia, nitrite, and nitrate. These will be useful come cycling time and in the early weeks/months of fish keeping.
Read up on what type of bottom fish you’d like that are compatible with your water parameters and select a substrate to fit their needs.
Once you know your pH, GH, and KH, you can start to choose fish that prefer your particular water type. This testing stuff is boring, but crucial in picking the right fish for your water. If you choose fish that are not compatible with your water, you’ll have to read up on water mixing using RO or distilled water to soften your water or different options to harden your water.
Then you’ll have to read up on here at TFF which method of cycling you plan to implement. There are several proven types…..just pick one and follow the directions listed. You do have to plan and set up your tank to successfully deal with the nitrogen cycle in the beginning for sure. Once your tank is established and has beneficial bacteria growing, fish can be added and testing for ammonia etc can be greatly reduced.
Get this going and post how you’re doing or ask specific questions. Btw…..if your water is right for these fish, your idea of one or two Honey Gouramis (I’d go with one) with a shoal of 8 or so Ember Tetras would be nice. A few bottom cleaners which do actually need their own pelleted food like corycats would be good as well.
Finally, your concerns about over stocking are good. The above mentioned fish WITH regular decent sized water changes with matching water would make your tank work just great. Having real good filtration would also help tons. Imho, a HOB like a Fluval AC 30 or 50 would do the job as would a Seachem Tidal HOB. Just stay clear of the cartridge variety of HOBs….they simply are not ideal cost wise, bacteria wise, or filter media wise.
Let us know how this all goes along and good luck.