1: This is up to your coordination with the other ATC.
2: Negative. Only for LTBA. There are 2 ARR APPs in the picture. If 05 is active for arrival, then LTBA ARR APP will cover LTBA_S_APP. If 23 is active, then LTBA ARR APP will cover LTBA_N_APP. I wrote ARR APP in order people to understand what is what
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3: Positive. Below 8000ft. traffic is transferred to LTBR TWR for procedural approach. You can send the traffic to UNICOM or assist him for procedure and ground movement if no LTBR TWR is online.
4: For the 3rd time, we assigned gate numbers. We didn't have the opportunity to put into practice. Hopefully during this event, we will. I will try to make a page for that.
We have APOM TR which is the atc procedures operating manual, but it is in Turkish. But since you have GCA, I assume you are familiar with the standart procedures. For VFR please take a look at VFR charts
BUT VFR is not allowed for LTBA, and during the event it will not be allowed. Always use RNAV SIDs and STARs, try to give initial climbs as defined in the RNAV chart. Also please check
http://ivaotr.org/rfe/about for other minor details.
About non scheduled flights, they are always welcomed. We have no rule against those who don't book.