Hi gerd, welcome to the forum
Before I get round to the fish, do you know whether you have hard or soft tap water? That info should be somewhere on your water company's website. You have soft water fish on your list (angels, apistos, kribs, discus) and hard water fish (rainbows). Unless your water is in the middle of the hardness range, you could have problems. And discus need soft water not just middling.
For the most part, your wish list looks fine. The things I would bring up are;
Silver sharks are a shoaling species; you need more than one. But as you are aware, they are big fish. I would leave them out.
Clown loaches need a bigger tank than the Roma 240, and more than 4 of them. They need a tank with a footprint at least 180 x 60 cm. But there are a lot of other loach species out there which would be very suitable for your tank.
Discus might be a problem as they need warmer water than the other fish on the list.
Kribensis are African, the other cichlids are American; they do not understand each others' signals and there may be problems keeping kribs with the others.
The other fish (eg rainbows) may be too boisterous for gouramis of any sort.
I would leave out the silver shark, discus and gouramis; change the species of loach; get more rainbows; leave out the kribs and get more apistos. You could easily have 1 male and half a dozen females in that size tank, and females are a nice bright yellow rather than the drab colours that females are in some types of fish.
One thing to be aware of - if you end up with a male and female angels that decide to pair up and lay eggs, you could have a tank with two angels in three quarters of it, and all the other fish down in the remaining quarter. Have a back-up plan ready in case this happens.
Sorry, I seem to have shot down most of your list
One other piece of advice - while the tank is cycling, go to as many fish shops as you can to see what they stock. They will stock more fish than in the profiles on here and you may well change your mind
I'll leave plants to other members. I have just java fern and anubias attached to wood - I'm not terribly green fingered.