Sizes of Sprites!

Hello! I'm new to this forum, and I was wondering about something resource related. I'm currently making a game, and I'm working on making the sprites (I'm using Ragnarok Online sprites for the battle/world map screens for RPG Maker 2003). And well I was wondering something, and I know this is a total newbie question, but what is the sprite size for each sprite for the Battle Character Sprites? I need to resize an Assassin Cross so that he doesn't look like crap.

I was asking this because, when putting them into a template, he takes up two squares from his head to his feet, and I want to know the dimensions to resize him with Photoshop, or perhaps there's a better program I should be using? Any help would be great!

Also, I was wondering if I do post a few sprites up here, maybe you guys could give me a few pointers, I'm literally pieceing them together lol. I found a website that had all the sprites and it gives them to you in pieces. So anyways, thanks for the time, hopefully I can find some help. I'm horrible with sprites. I can't even color them ;_;

- ADJ

P.S.
Also, same question for the on screen characters. Thanks!

Each animation frame is 48x48 pixels.

Just use the help in the maker.

Ah well thanks! Brings me to my next question. Basically getting them to fit into that square is simple. I was meaning the SPRITES within that 48x48 box. I'm using Ragnarok Online sprites, so I was wondering what would be the best way to decrease there size in a manner in which it won't make it appear like a blob of pixels. lol.