What change should be made to correct this sentenceWe will need the following supplies for our school garden Shovels rakes wheelbarrows and compost.?

Add a colon ( : ) after the Word garden. Change the uppercase S on shovels to lower case. Add commas after the Words shovels and rakes. So it should read:

We will need the following supplies for our school garden: shovels, rakes, wheelbarrows and compost.

Older style would also put a comma after wheelbarrows but that is no longer used.