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(Original: Template:Welcome-citationunderkill, now at Template:Welcome-citation, with "Wikipedia:Civility" added.)

(Personal opinion: When you start editing, it looks better if your user name is not a red link (which, in a user name, tends to be the sign of a spammer). Your user homepage doesn't have to be complex—as an example, see my German Wikipedia user page, which has a simple greeting.)

Personal opinions on best practices:
((cite journal |last1=Guzman |first1=JA |title=Carbon monoxide poisoning |journal=Critical Care Clinics |date=October 2012 |volume=28 |issue=4 |pages=537–48 |pmid=22998990 |doi=10.1016/j.ccc.2012.07.007))
not
((cite journal | last1 = Guzman | first1 = JA | title = Carbon monoxide poisoning | journal = Critical Care Clinics | date = October 2012 | volume = 28 | issue=4 | pages = 537–48 | pmid = 22998990 | doi = 10.1016/j.ccc.2012.07.007))
As for formatting a reference vertically, it does make the reference easier to discern, but makes the surrounding article text all but impossible to read (try to find the phrase in the in between the references).
<ref>((cite journal
|last1=Guzman
|first1=JA
|title=Carbon monoxide poisoning
|journal=Critical Care Clinics
|date=October 2012
|volume=28
|issue=4
|pages=537–48
|pmid=22998990
|doi=10.1016/j.ccc.2012.07.007
))</ref> that is, Davies states thus<ref>((cite journal
((cite book
|last1=Bleecker
|first1=ML
|title=Occupational Neurology
|chapter=Carbon monoxide intoxication
|date=2015
|series=Handbook of Clinical Neurology
|volume=131
|pages=191–203
|pmid=26563790
|doi=10.1016/B978-0-444-62627-1.00024-X
|isbn=978-0444626271))</ref>
The relevant section of Cicero as printed in the source is reproduced below with fragments used in ''Lorem ipsum'' underlined. Letters in brackets were added to ''Lorem ipsum'' and were not present in the source text:((quote |[32] Sed ut perspiciatis, unde omnis iste natus error sit voluptatem accusantium doloremque laudantium)) : <nowiki>Yadda yadda

as opposed to:

The relevant section of Cicero as printed in the source is reproduced below with fragments used in ''Lorem ipsum'' underlined. Letters in brackets were added to ''Lorem ipsum'' and were not present in the source text:((quote |[32] Sed ut perspiciatis, unde omnis iste natus error sit voluptatem accusantium doloremque laudantium))

and

Yadda yadda
[[File:Picture|thumb|Caption]]
Yadda yadda

versus

Yadda yadda[[File:Picture|thumb|Caption]]Yadda yadda