Scientific Poster Assembly

I need help assembling an educational poster for a trade show using illustrations that I have created and scanned at finished size, and text that I have written. The poster can be printed locally. The attached photo shows a rough draft done by hand.

Requirements:
- Assemble illustrations with text
- Formatting Title and headings
- Text descriptions and labels
- I have a general idea for layout, including a hand-drawn mock-up, but need some assistance in creating a strong, polished layout.

Ideal skills and experience:
- Proficiency in Adobe Photoshop or other suitable programs.
- Experience with scientific or educational poster design would be ideal.
- Strong layout and typography skills