Choosing first problem is one of the greatest… problems for beginners, since SPOJ gives you access to a vast problem archive. For present, the best indicator of problems’ difficulty level is number of users who had solved it and percentage of accepted solutions (in the near future we plan to build a tag system that will allow to categorize problems and enable convenient navigation through problemsets). Depending on your skills and experience, you can choose easier or harder problems. Everyone will find something suitable, that’s for sure.