Screen printed boards are definitely preferred by experienced skaters. Exposing curved screens is a hassle. Some shops just glue the positive to the screen. Back in the day I vacuum bagged mine. You can go pretty detailed in your art, but the relatively loose screen material, the odd shape and the non wet on wet printing do not lend themselves to really detailed art.
here is a link to the all time classic instruction that used to be found on Bowlrider.com This link is to a copy on the WayBack Machine. There are a few pics that don't display, but they relate to washing out the screens, so it is no big.
I can't get the link to work from here and open the right page. It seems to be an issue with the archive website itself. If you want to check out this skateboard printing tut go to
http://www.archive.org/web/web.php and then enter
www.bowlrider.com in the Wayback Machine box. Choose the year 2003 and then select the last web crawl date for that year. The bowlrider page opens. Select continue. On the next page select "screen'n" from the menu bar. "Printing the D20 Way" opens.
A lot of skate decks are now printed on the veneer topsheet then the boards are pressed. But that puts you in the board making business. Have fun!