Welcome to your first Clean-a-thon Shaun,
Just to get you started, you might like to try to clear a few 802, empty profile suggestions, which I find one of the easiest to do.
Choose profiles of people who lived during the census years, and have some locations mentioned and family members attached to them. I tend to just use the familysearch website, and try and add two or three sources to each profile, along with the standard headings that should be in the bio section.
Another fairly easy suggestion code that is in need of some work is 851, gedcom uncleaned interpret date. If the date has already been corrected, then simply remove the gedcom statement from the bio. Otherwise add the date from the bio to whichever location it refers to, and then tidy the bio. The three easiest formats to correct are a number string, as in 1361925, those that contain 'th' as in 13th June 1925, and those with '/' as in 13/06/1925.
Whichever suggestion codes you chose to work on, always try and remember to leave a comment in the 'Explain your changes' box. For the 802 suggestions I'd put something like 'Clean-a-Thon 2018, added bio headings and sources'. And for the 851, something like 'Clean-a-Thon 2018, tidied gedcom date error in bio'. The profile manager will then know what you've done and it should limit any feedback that you get.
Maybe you could have a little practice before next weekend, so you feel happier with what you are doing.