While you can play without investing a dime you won't have a good build to make interesting stuff. Many people won't party with you so you will need to make parties yourself. Some solo stuff like timed hunting zones and the solo instance in Aden will be really hard for you. If you have time you can play the market, buy and resell stuff... this will give you some adena instead of having you investing real life money on store items. Many games have gone this path... I'm ok with it, the problem is that in L2 the amount you have to invest for certain stuff is absurd. My advice is, just keep playing, get 105, try to do 105 level stuff like dailies, grinding, instanced zones, feel how your character behaves, the strength you have, what you can achieve, and start exploring your options to improve your character.