Photo's and graphics #2?

Hi to all lyx-Users I am new to publishing in general and specifically LYX, and hope to create a couple of books re our family tree, containing lots of charts and photos. Another question that I know will have a simple answer but for the life of me I cannot work out: After inserting a Photo

Photo's and graphics? -- Australian English? -- Page Dimensions?

resize the page & pdf format? * Where do I find definitions of (ps?pdf), (pdflatex), etc, etc? Cheers Peter Patten Melbourne Australia…