Check out saveourmonarchs.org and livemonarch.com. Both will send free milkweeds seeds for an SASE. So far as acquiring things from this site, it would be a good idea to fill in some more information on your profile. Basic information like what zone you're in will help us know if the seeds we have will work in your area. Don't want to grow perennials native to Florida, up in Minnesota...its probably not gonna end well. You'll also want to make sure messaging is enabled in your profile so people can send you messages. Instructions for that and some other generally helpful info can be found in this post... http://forums2.gardenweb.com/discussions/3371179/attention-newbies-please-read?n=33

You should definitely look into the monthly "Newbie Seed Project". Val sends out loads of free seeds for nothing but postage. http://forums2.gardenweb.com/discussions/4425880/february-2017-newbie-seed-project?n=39

Lastly, Welcome to the forum! This place can be a bit addictive. Have fun.

I have common and swamp milkweed, unfortunately they have been inside all winter and will have to spend some weeks in the cold before they can grow (at least the common, not sure about the swamp). Also stinging nettle (host plant for red admiral and others) and Mexican sunflower. Message me your address if interested. Last summer was my first year saving seeds so I'm not sure if I did it right or if they are viable. But they are free :)