I need to fix a decking joist to the external brick walls of a house but I'm not sure how to do it. I have read that you should use expansion bolts, but I have never used these and don't know how they work. What size bolts do I need, what size drill bit should I use, do they attach themselves or do I also need some kind of plug, do I tighten them with sockets, spanners, or what? Please help with as much detail as you can. Thank you.