Best solo class/Viability of Warrior

[Deckk]

I want to start playing, but I'm totally unsure what direction to go in.

I guess my first question is:

How is grouping in p99? I'd like to play a warrior, but without a group I'll be pretty screwed.

Second question: Is this as old school as old school gets? Meaning, do casters have to meditate for an hour to get full mana?

Third question: Which classes solo best? If I remember correctly, druid was the go to for solo players.

Thanks!