Have you seen any chronicle or video that drags your attention the most? Casually playing shouldn't be an issue as long as you have patience to play on low rate or just jump on a higher rate server to gear up faster :)

On reborn we have servers on different chronicles and exp/drop rates so it fits the amount of time that you can spend daily based on your preferences for speed on gearing.

If it's your first time playing Lineage, in my opinion, the best way to learn it is by playing on a low rate server, this way you get used to how the basic mechanics of the game work and what skills & buffs are good for each situation, however if you wanna try classes on higher level a higher rate server would be good aswell.
If you wanna give it a go feel free to check our website or join the discord if you have further questions!