I'll teach you how to properly enter a cafe, take a table, pay and leave tips.
These are just thoughts out loud about what I learned over several years in the Czech Republic.
Entering a Cafe.
First, in the Czech Republic men enter a bar first, this is one of the clear rules of etiquette not only in the Czech Republic, but in Europe in general. Many locals joke that this is from the times when chairs flew at whoever entered :)
I usually enter unhurriedly, because in one out of ten cases a waiter will approach and choose a table for you.
In general, you can usually sit right away at any free table, while using common sense: don't sit as a couple at a table for eight, etc.
On the other hand, even if you sit at a big table at lunch, nothing terrible will happen, just be ready that someone might sit with you.
In the Czech Republic it's considered normal to say "hello", "goodbye" around. In general in Europe I greeted closely sitting people, nobody complained. However, for example, in France they didn't really reciprocate, but in Germany and Vienna - yes.
When ordering beer in 99% of cases the waiter will mark on paper the number of glasses ordered with dashes. Watch that everything's correct :)
Sitting at the Table.
In the Czech Republic they'll immediately ask you what you'll drink. Here are 3 options. First - just say "beer", "jedno", "wine", "limo", something like that.
Second option - ask what's available if you don't trust standard options.
Third (not the most common) - ask to wait while you figure out the menu.
Usual observation - waiters expect you to order drinks as soon as you sit down, and while they bring you drinks you'll choose food.
Drinking Beer.
If there are beer mats (coasters) on the table, put one near yourself. If they're not there, most likely they'll bring as many as you ordered. Don't break or tear them :) The cleanest one you definitely need to steal.
Before drinking the first glass, you need to look each other in the eyes (this is important), clink glasses, say "na zdraví", hit the bottom of the glass on the beer mat. And only then can you drink :)
If there are Czechs among you, they should correct you if you're doing something wrong. If they don't correct you, they probably don't like you, since the whole process is quite authentic :)
Asking for the Bill.
Look around at how people pay. There are 2 options. First - pay at the bar. Second - call the waiter, saying "we'll pay".
Paying.
They'll ask if you're paying together or each separately. Good form - pay together or at least in pairs.
Most likely the waiter will approach with a payment terminal and a big wallet. They'll count and just name the sum. Throughout Central Europe they pay the same way - you need to say the sum aloud including tips. For example - lunch cost 129 crowns. You hand over 200 and say "one hundred forty". They'll give you 60 crowns change. If you don't say anything, it's assumed you're not leaving tips.
Not leaving tips here is quite normal, nobody will be surprised or sulk. After lunch it's quite adequate to add even 10 crowns. For dinner 10% is usually enough.
A couple times in my life here I've seen the Russian system where they bring a little book with a check. Most likely you won't encounter this here.