Nostalrius Begins - Quality wow vanilla realm (1.12)

So I've been going full combat for levelling as a rogue, but have no clue what the order of importance is in some of the talents. So far I've gone in this order:

Imp SS (2/2)
Lightning Reflexes (3/5)
Precision (5/5)

Can someone tell me what the optimal order is after these 3 for levelling solo? Should I be putting any points in assassination or sub at all? I was told full combat was the way to go.

Riposte. Get Riposte as fast as you can, it's the best leveling skill ever.