Get your STR and VIT to 90 as soon as you can for the heroic backpack bonus. Your DEX is a bit low but the LUK may make up for it and your HIT might be okay.
TI is the easiest way of leveling and doesn't really require supplies. Soloing does require pretty good gears and/or expensive supplies. If you are soloing, you will need supplies for recovering HP or SP and AOE with rolling cutter. Killing monsters one at a time and sitting to recover HP and SP isn't an option and is extremely slow. TI will give you much better exp rates compared to that. Rudolf hat with carrots is the most popular way of recovering HP. Witch Pumpkin Hat and Alarm Mask + pumpkins works as well. Rideword hat, nid garb, earth deleter card, loyal Incubus pet are some ways to recover SP. (Slim) white potions, mastela fruit, strawberries, light blue potions can be used of course but the zeny costs will start to add up.
For GX in particular some may choose to use a specialty jur [4] with four hunter fly cards to recover HP. Jur [3] with three hunter fly cards also works.
You may want to consider using a garment that gives you some neutral resistance or one you can put raydric card in. Otherwise monsters are going to hurt quite a bit, especially since you can't use a shield when killing things. Variant shoes or other footgear that gives +% HP or cards that give you more HP can also help you have more max HP and be less squishy.
For the higher levels, soloing with a GX can be expensive as you may need EDP to do decent damage.
Juperos, Abyss Lake, Rachel Sanctuary are some places you can consider soloing at once you are more prepared.
Edited by kasshin, 20 October 2012 - 01:22 AM.