Ideas?

If there is one goal I would like to achieve in my classroom, it would have to be... student involved with technology both inside and outside of the classroom. Although most schools lack the tools to meet every teacher's dream.... COMPUTERS IN THE CLASSROOM, there is one thing that peaks my interest and i hope to experiment with. I would really like to create a webpage of some sort to have parents and students check-in whenever they want. Parents can have a certain code to view their child's grades or get a copy of any assignments their child may have missed. Students can safely interact with eachother or get their assignments/worksheets online and possibly send them online. The webpage can display class photos, students' artwork, student of the month, and any other achievements. I would like a webpage that requires parents and students to log in so that it is kept private and secure. However, I wonder if there is such a thing where their log in codes expire at the end of the school year that way i don't need to create so much webpages and what not. I'm not sure how to go about this. So if anyone has any websites that allow me to create a safe student/parent-friendly environment and is FREE, please feel free to drop a link. Another thing, anyone know of user-friendly (i mean... REALLY EASY to understand and manage AND FREE) grading system/portfolio online that i can use for my class? This is all new to me, and i'd like to learn more about it.