Kevin: John's advice to look at the JOMSA Author's Guide is the first step anyone interested in authoring an article should take, but for the record below are answers to the questions you asked:
1. All images for the Journal need to be at publication size and at 300 dpi resolution. Images for single medals should be approximately 3.0 to 3.5 inches in width, with corresponding greater widths for additional medals. We are limited to about 6.4 inches width for images (the useable width of the page). It is better for the photo to be too large, rather than too small.
2. The aspect ratio should be what ever the proportion of length and width are for the actual item.
3. Times New Roman 11 is used for the text of articles. Captions are Times New Roman 10 bold italic.
4. The Journal is digitally prepared in 'In Design' which requires that the photos and text be inserted separately. Because of that the text should be submitted in MS Word without photos and the photos should be submitted as separate jpeg or tiff files.
All of this information, and much more, can be found in the JOMSA Author's Guide.
Please feel free to contact me by email or phone if you have further questions. My contact information can be found on the right side of the Table of Contents page of each issue of JOMSA. I look forward to receiving your article.
Regards, Dick Flory, JOMSA Editor