For maximum control, I’d use a professional layout app designed for this exact thing. Adobe InDesign will let you organize images and text (for captions, titles, etc.) inside of a single or multi-page document. You can then print or export to a PDF at any time, and at any resolution. I make high-quality PDFs for my printer, and lower quality for emailing.
Yeah, it’s a ‘whole new thing to learn,’ but its quite straightforward if you already know either Photoshop or Illustrator. Knowledge of this tool is an investment in your career. At least check it out.