Welcome to the site.
I had a D50 and sold it to one of my sister in laws. Still a capable camera now a days. With the ISO performance basically the limiting factor. You can use absolutely cheap SD cards in it. Do not buy more than 2gb, it will not use SDHC cards (4gb and higher)! Just SD. Also when looking at lenses AF-P lenses will not work on it in AF or VR. But you can use the older AF, AF-d (both body af motor lenses) and newer AF-s (lens motor lenses). So basically just skip over the AF-P lenses. There are tons of videos of the D50 on youtube.