Write an Onboarding Welcome Email

Write an onboarding welcome email for this product or service:

Product / company: [NAME]
Audience: [WHO JUST SIGNED UP]
Primary first-week goal: [WHAT SUCCESS LOOKS LIKE IN WEEK ONE]
Key features to highlight: [LIST 2 TO 4]
Support channel: [HELP CENTER, CHAT, EMAIL]
Tone: [FRIENDLY / PROFESSIONAL / PLAYFUL]
CTA: [PRIMARY ACTION LINK OR BUTTON LABEL]

Requirements:
1. Subject line plus 2 alternate subject lines under 55 characters.
2. Preview text that complements the subject without repeating it.
3. Body under 180 words with one clear primary CTA.
4. Include a short next-steps checklist (3 items max).
5. Do not invent features, pricing, or guarantees not listed above.

Deliverables:
1. Final email draft (subject, preview, body, CTA).
2. Two subject-line alternates for testing.
3. A one-sentence note on what to A/B test first.