Here is a rough overview of how to skill your character in Gothic 2 if you want to become a mercenary and subsequently a Dragonhunter and focus on wielding one-handed weapons, as well as a bow. Your focus is going to be dexterity and the ultimate goal is going to he having a total of:

160 Dexterity
94% Bow-skill
150 Strength
100% One-Hand-Skill
As well as a bunch of needed skills for progression

The total level needed for this build is only level 48!

Overview of the stats learned and gained through other means

Strength (150):

Chapter 1	Chapter 2	Chapter 3	Chapter 4	Chapter 5
10 Base	35 Training	10 Training	11 Training	01 Thekla’s Stew
02 Training			01 Fire Stew	12 brewed Strength elixirs
			02 Dragonroot
			04 Apples
			01 Erol
			04 Thekla’s Stew
			09 Found & Bought Strength elixir
			01 Stew (Jharkendar)
			15 brewed Strength elixirs
			22 Stone tables
			10 Prayer

96 LP

Dexterity (160):

Chapter 1	Chapter 2	Chapter 3	Chapter 4	Chapter 5
10 Base	13 Training	01 Goblin berries	03 Goblin berries	~20 Goblin berries*
47 Training	02 Stone tables (Valley)	06 Found & Bought Dex elixir	04 Stone tables (Valley)
	06 Stone tables (Khorinis)		10 Prayer
	12 Stone tables (Jharkendar)
	01 Rengaru
	06 found Dex elixiris
	39 brewed Dex elixirs

102 LP

*Paladins have a chance of dropping Goblin berries or having them in their vendor inventory. You find a couple of dead Paladins in the valley, but you could theoretically kill or beat-up every single Paladin in the game for the maximum chance of getting berries, which is how you get to a number like that. If you do not do that, you should maybe get one or two on average.

1-handed weapon skill (90%+10% from weapon):

Chapter 1	Chapter 2	Chapter 3	Chapter 4	Chapter 5
10 Base			05 Southern Defense Art	05 Training
10 Training			34 Training	03 Wulfgar
				23 Stone tables

74 LP

Bow (94%):

Chapter 1	Chapter 2	Chapter 3	Chapter 4
10 Base	04 Stone tables (Valley)		04 Stone tables (Valley)
11 Training	06 Stone tables (Jharkendar)
	16 Stone tables (Khorinis)
	43 Training

84 LP

Misc.:

Chapter 1	Chapter 2	Chapter 3	Chapter 4
Skinning pelts (5 LP)	Elixir of Dexterity (20 LP)		Dragon blood (3 LP)
Stealth (5 LP)	Minecrawler plates (3 LP)		Elixir of Strength (20 LP)
Lockpicking (10 LP)	Shadow beast horns ( 3 LP)
Pickpocketing (10 LP)	Stone table language (30 LP)

109 LP

Total: 465 LP

Additional information:

The chapter order of some of the skills is not entirely mandatory. You could for example focus more on One-handed skill and finish that up first, before going for Bow-skill. However some of the permanent bonuses (like Thekla’s Stew for example) are only available in the later chapters, so bear that in mind.

You are going to be a Dragon hunter which means you want to learn how to pull Shadow beast horns because there is going to be a quest to sell those to Buster on Onar’s farm. Each horn gives 300 EXP (as well as 300 gold) which realistically means that you are going to get those 3 LP back fairly soon. There are 9 Shadow beasts in Khorinis alone (more spawn in later chapters and you can also find some in Jharkendar and the Valley)

Minecrawler plates are entirely optional and only necessary if you want to get the armor (which is advisable in my opinion)

The other stuff is pretty much mandatory for completing the game or for say getting the Dragonhunter armor.

Also, make sure to have a properly optimized and enhanced Gothic 2 Installation with Spine