I have a cheap android tablet that I want to use behind some 2 way glass. So I want it to display a webpage on startup. If possible it would be better if it also could run a webserver with PHP, msql and similar. As the tablet would be behind glass there would be no need for it to do anything else. I guess I could have it using some sort of camera activity on face recognition, or movement detection. These would be extra features.for a later date
If I understand what you're actually asking - "Open an app on startup" - then Tasker should be able to handle this pretty easily.
Get Tasker from here (it does cost £2.99 for the app. For me, it was well worth it as its a very powerful tool. I guess it depends if you would get any other use out of it). You then need to create a Profile (the context of the device at a particular time) and a Task (what you want the device to do).
Create a profile to run the task on device boot;
Profiles tab > Add new profile (+ button) > Event > System > Device Boot
Create a new task (it should prompt you to do this);
Add a new action (+ button) > Net > Browse URL > enter the URL