I'm a real novice when it comes to this but know my way round hardware and other electronics. My plan is I want to have all my lamps in my room and projector screens on a remote switch/Alexa without spending a fortune on control systems. I think have sourced the correct parts - a wifi chip and an 8 way 240v relay box. Can I accomplish my plan with these bits of kit and could I have a bit of guidance on how to go about the programming and 'plugging' up of the Arduino side. The lamp and projector side I can figure out myself and have already worked it out.
You made a couple of mistakes up to now. You didn't read the forum guide in the "please read" sticky post before you posted your question. If you had, you might have asked a question we could actually answer. Second mistake was buying components first and asking for advice second. You may have wasted your money, or made life more difficult for yourself.