Absolutely. Well, it's generally possible to cast Ballista for 0, it's just that it usually dies immediately upon entering the battlefield, but here, Force of Virtue's static ability makes it 1/1 as soon as it exists on the battlefield, so it's safe.
Assuming you're again casting the Ballista for 0, no. The Ballista dies as a state-based action for having 0 toughness immediately after entering, even before Soul Warden's triggered ability can go on the stack. By the time you gain 1 life, the Ballista's in your graveyard.
I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
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Everyone is talking about the new combo with Walking Ballista inside the Soul Sisters archetype.
So have two questions for this exciting possibility.
1) Having Force of Virtue on the the table would be possible to cast Walking Ballista for 0 ?
2) Having Soul Warden and Heliod, Sun-Crowned on the table is it possible to cast Walking Ballista (and make it survive) since you gain life and put the Heliod +1/+1 counters on it.
Assuming you're again casting the Ballista for 0, no. The Ballista dies as a state-based action for having 0 toughness immediately after entering, even before Soul Warden's triggered ability can go on the stack. By the time you gain 1 life, the Ballista's in your graveyard.