I have a signal to open long position on EUR/USD and I do buy 0.1 lot. So:
1. When is VOLUME affected? By open position OR by close position OR by both (open and then close too) (IMHO: both)...

2. Will increase the ASK or BID volume if I buy (open long position) it? (IMHO: ASK volume when BUY, BID volume when SELL)...
OR
3. Does it depend on which Offer Side I have selected? (e.g. I have selected BID Offer Side so if I do buy or sell, the BID VOLUME will increase and reversal: buy or sell on ASK Offer Side => ASK volume) (IMHO: this is bullshit... The 2. is correct according to me)...

4. When I do buy (open long position), then the price should go up (increase) or down (decrease)? (IMHO: BUY = GO UP, SELL = GO DOWN)

And later I have a signal to close that opened long position on EUR/USD and I do sell 0.1 lot. So:

5. If VOLUME is affected by close position too, then which volume will increase? (IMHO: BID volume when CLOSE previous BUY, ASK volume when CLOSE previous SELL, simply in reverse than 2.)
OR
6. Does it depend on which Offer Side I have selected? (e.g. I have selected BID Offer Side so if I close position, the BID VOLUME will increase and reversal: close position on ASK Offer Side => ASK volume) (IMHO: this is bullshit... The 5. is correct according to me)...

7. When I do sell (close that opened long position), then the price should go up (increase) or down (decrease) or it doesn't affect the price? (IMHO: CLOSE previous BUY = GO DOWN, CLOSE previous SELL = GO UP)...