Great initiative. The Wiki contains many well-written articles, we ought to help them not get drowned in the noise. Rather than just starting to work on random items, I'm volunteering to help with things identified as most urgent by those who are more involved with the Wiki. PM me.
Well, I appreciate your offer but in the wiki there is no guidance right now. Look into the
special pages if you feel like cleaning up stuff.
Most of these lists help find sites that may be deleted.
Orphaned pages might not have been visited in ages. Either link them from where it makes sense or suggest deletion.
Pages with just one contributor that were not edited in a year and not visited in months might be candidates for deletion.
Popular pages might be worth putting some love in the design and content. Make them look pleasing. Add references. Add more facts. Add an image or two. Remove "noise".
In general, put pages on your watch list and care about changes. Vandalism happens (like referral link spam or people trying to change bitcoin addresses to their own addresses) and with a vigilante community, these survive only some seconds or minutes.
Read the discussion pages if you feel like something is not ok with a page. You will find other people's suggestions that you might want to comment on or add suggest your changes.
Be
bold. If you think it's a good idea to split/rewrite/illustrate/restructure/… an article, do it. Reverting this is much less work than doing it in the first place and as long as you don't start an edit war, nobody will argue with you doing things wrong.
