Level 15 - 2 SP into Improving Max HP Increase (Improving Max HP Increase is now maxed at level 10), 1 SP into Power Strike

Now that the skill that ensure you have a lot of HP is maxed, its time to max your attacking skill.

Level 16 - 3 SP into Power Strike (your primary attacking skill till level 120)
Level 17 - 3 SP into Power Strike
Level 18 - 3 SP into Power Strike (power Strike at level 10 now, keep your SP from now on)

I suggest keeping the additional SP because if your Power Strike is more than level 10, MP cost is double but damage is only increase by a little. If this is your 1st character, you will find that the MP cost is very expensive for you.

Level 19 - save 3 SP
Level 20 - save 3 SP
Level 21 - save 3 SP (you have 9 SP now)
Level 22 - 10 pts into Power Strike (Power Strike is maxed now), 2 SP into Slash Blast
Level 23 - 3 SP into Slash Blast
Level 24 - 3 SP into Slash Blast
Level 25 - 2 SP into Slash Blast (Slash Blast at level 10 now), save 1 SP
Level 26 - save 3 SP
Level 27 - save 3 SP
Level 28 - 10 SP into Slash Blast (Slash Blast is maxed at level 20 now)

Now all your important skills in 1st job is maxed, and you have 6 more SP till u make the 2nd job advancement. This 6 SP are relatively not important. You can choose either choice.

Route A
Level 29 - 3 SP into Endure
Level 30 - 3 SP into Iron Body

Final SP allocation = 5 Improving HP Recovery, 10 Improving Max HP Increase, 20 Power Strike, 20 Slash Blast, 3 Endure, 3 Iron Body

Route B
Level 29 – 3 SP into Improving HP Recovery
Level 30 - 3 SP into Improving HP Recovery

Final SP allocation = 11 Improving HP Recovery, 10 Improving Max HP Increase, 20 Power Strike, 20 Slash Blast

From level 30 to 70 - training ground

Here are some suggested nice training grounds at suggested levels. Again you may choose to go to the maps at slightly lower or higher levels.