If you purchased Bosh plugs, they are already gapped. If not or you want to check, I think it's .32mm. Do a search, I know I've seen this many times.
Remember to grab the wire boots(not the wire) and twist before you pull.
Good luck, your enthusiasm is refreshing.
91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)