New cross-border seller here, looking for real advice.

Total starting capital is around $20,000 USD, very tight for a small seller.

I have about 6 months of Temu operation experience but almost zero Amazon experience.

My current planned categories:

  • Pet supplements with ODM custom for brand building, targeting US & Middle East

  • Low-end perfume with ODM custom for brand building, targeting US & Middle East

  • Toys and furniture repair parts recommended by a popular Amazon educator

I need honest opinions on these 5 points:

  1. Which of these categories is realistic to launch with my budget?

  2. Which platform and marketplace are best for the easiest, lowest-risk launch?

  3. I’m considering pet supplements on cross‑border platforms like SHEIN for the Middle East because of overlapping pet owner audiences. Is this viable for a beginner?

  4. How should I allocate my $20,000 to avoid losing money and speed up validation?

  5. Fully managed service, semi‑managed, or self‑run? Which allows faster growth with limited funds?

Any real seller experience is appreciated. Trying to avoid common beginner mistakes and get a working model as fast as possible.