muhammad_a: I then encounter my next problem, trying to focus on something. There's no crosshair. It takes me about 2 minutes to select the statue of Innos, give my money and pray to it.
You're referring to the statue of Innos beside the farm? This is because there are various items on the statue's base.
Interaction in the Gothic games works by targeting whatever is near to the centre of your view (its name will be shown above it). This makes it very easy to interact with items/buttons/etc. (even the tiny gold coins found in various places) without having to point at them precisely (as in Morrowind and the like). This can make it tricky to target a particular item in a group of items, but that doesn't matter because you are never required to do that as part of the game. There is no weight or encumbrance limit, so any time you're faced with multiple items you can simply pocket them all; switches and other important things are always far enough apart that you can't target the wrong one.
If you want targeting to be more obvious, try experimenting with the Combat focus and Object focus settings under Options > Game Settings. These give visual feedback for targeting, e.g. if you set Object focus to "lighten" the thing you're pointing at will be noticeably lit up (in addition to its name being displayed above it as usual).
muhammad_a: The combat feels meh, although confusing at first. I got killed, oh, about 5 times. Yes, the hero who have saved the world from evil beyond time and space was killed by a pack of hungry young wolves, that's the kind of epic that will survive through the ages.
The necromancer mentioned that my character had achieved great feats that can only be done by the best of the mortals and have to start all over again, why?
Well, he's all but dead at the start of the game (as shown in the opening cutscene) so this is a convenient way of explaining why his stats have been reset.
As for combat, it is deliberately awkward because of how things work. Getting combat training doesn't just boost your damage, it also makes your attacks faster and unlocks additional combo steps. If you disable the Gothic 1 controls option the left and right attacks get their own keys which you might find more convenient, but you'll still need to raise your character skills to pull off proper combos.
As for the wolves, this is both because of Piranha Bytes' tradition of the player starting very weak and also because the GOG version installs the Night of the Raven expansion by default, which makes all aspects of the game significantly harder (at the request of players who thought the base Gothic II was too easy). The GOG installer gives the option of installing without the expansion but this does mean you'll also be removing the huge amount of extra content added by the expansion.