I would agree with the other ladies, if this is your first attempt at cross-stitching, I would start off with something smaller with a lot less color changes. Fifty-eight colors is a lot for a beginner to have to contend with. This looks like a cover-all pattern to me (everything including the snow is stitched) so since the fabric won't show when the design is complete, I would simply use white. The easiest count for beginners is 14 count. This could also be done in 16 count or 18 count, which would make it a bit smaller. The choice is yours. There will be a key included with the pattern which shows you what colors you will need and a symbol assigned to each color will show you where on the pattern each color is used. Good luck!
(Oops, I see by your comment, havenfowler, posted a few minutes before mine, that you have been stitching for a few months. Oh well...)