Dead easy, you are doing it right now.
There’s a spring and fall box (twice a year) that covers all of the Co-op seed runs preservation runs etc. you sign up for. There are spontaneous seed giveaways (HINT: follow Corey 
)
Hang around here, post a grow log and settle in… You will soon have more beans than you can grow and explore in a life time (assuming you are old 
)
Cheers
G