Not necessarily under a bush.. I would put the seedlings in small pots that you can move- am possibly put the pots amongst the corn initially- to partially break up the direct light. After you get a couple sets of true leaves- then plant them in direct light. Be very careful when transplanting. Alot of the growers here "tier" their plants. It works as well indoors as it does out. You would basically start your seeds in a solo cup- with the bottom removed- and place that cup inside an intact cup so the soil doesn't fall out. When you go to transplant- you don't ever remove the seedling from the cup it's in- you just plant the cup with the removed bottom in the hole- allowing the roots to grow into the earth- rather than being confined. The cups will allow you to move the seedlings about a bit as needed- until they are ready to go into the sunniest place in your garden full time.
Clear as mud?? Hahaha