Hi Joanna!
I'm so glad to see you're interested in raising the Monarchs indoors for a bit. As Mellie said it's too late in the year now, but there's some things you can do to prepare for next year:
1.) Get some Milkweed seeds of species for your area, that you know haven't been sprayed with herbicides.( I'll send some if you need some)
2.) Winter sow them if you want to give it a try! Start collecting the bottles you'll need this Winter right now.
http://monarchbutterflygarden....
3.) Go out to Walmart and purchase a couple mesh laundry pop up hampers while they're in stock. The one I bought was approx $9. It's blue
4.) Read up all you can on various sites like Monarch Watch, Xerces Society, Pollinator.org., National Wildlife Federation, Etc. I have links st the bottom of my personal page here at NGA.
5.) Don't worry if you cant find the eggs right away. I always just collected caterpillars as soon as I spotted them.
6.) Feel free to run off a Tree mail to me anytime with questions and I'll do my best, I'm no expert, but I try
7.) Good Luck and happy learning!
~ Cheryl
I forgot to add one important detail: 8.) Don't be afraid to make mistakes. You will. Try anyway.