1. Stay with the starting area in Lineage2 of your chosen race. One notable exception is the Humans. Their area has a good mob density only up until about level 15. If you are Lineage 2 gold a human in this way, you will either need to leave
2. You can leave the island in one of three ways. Either pay the outrageous teleport fee, use the slower boat method or do the newbie quest to get the Giran Teleport scroll.
This quest starts with the Gatekeeper and a knowledgeable player should easily be able to port to Giran and with Windwalk, run to a more suitable leveling area. (Lineage 2 money) This does add quite some time onto the leveling curve.
3. If you are a Dark Elf and you are in the Light Elf area or a Light Elf in the Dark Elf area, remember if you die or if you port, you will not end up in the local town but in your race starting town. So if you are a Light Elf at the Spider's Nest a SoE will end you up in the Light Elf village.
It is also important if you are using a Shillien Elder to level up a Light Elf in that area. If your buffer SoEs they will end up in Dark Elf town, which may be far from what you are wanting.