Waiting for your translation attemps... 
(Don´t "quote", just write the numbers)

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1) DİKKAT KÖPEK VAR = Beware of the dog (literal -Beware there is a dog)

ısırır = it will bite

öper = it will kiss

5) Mezarlıkta piknik yapmak yasktır

It is forbidden to make a picnic in the cemetery 

4. DÜŞME

I am not sure but I guess a Turk could read this in two ways. It could be either the -mE infinitive  -  I guess this was ment, like saying the reason of this warning is düşme tehlikesi. Anyway, it could also be the negative imperative meaning ´Don´t fall!´ These are pronounced differently but it does not show in writing.

My Guess.

6

dont  litter it annoys me

7

dont walk next to more than two people

2. İlkokul mezunlarının rahatlıkla geçtiği sürücü kursu sınavını üniversite öğrencisi oğlum Abdulbaki Soydakök geçememiştir.  -  Babası Halil İbrahim Soydakök

My son, university student Abdulbaki Soydakök, could not pass the exam of the driver´s course which primary school graduates pass easily.  -  Halil İbrahim Soydakök, his father

yeah, it is imperative and the emphasize is on düş- part.

The funny thing is they are not trying to prevent something dangerous, like slippery floor etc. They are directly ordering the result not to be done!

3:
It is an obligatory to buy and drink tea if you used our restroom (loo).

Explanation: I think there is a coffe/tea seller over there and people using the restroom in the shop as if it is a public restoom and go away without buying anything! And the shop owner warns us, it is not free at all!

But without an explanation why the hell i have to drink tea after using restroom!!! Maybe to gain the liquid i wasted

vece is an incorrect form of WC (water closet). There is no w letter in turksh and people tend to read it as regular V.