It's very hard to get caucasian infants in America because (a) they're all too often aborted and (b) the birthmoms renege on the adoptions at the last minute. If this were me, I'd do the following:
1. Place advertisements in high school newspapers.
2. Speak with pastors from as many churches as you have the energy for, so that you are on their mind when a pregnant girl comes to talk with them.
3. Ask the pastor if you may put an advertisement in their church bulletin, or a separate flyer at their congregation's information table.
4. Interview adoption attorneys to find out if they can be a decent source of infants.
5. Stand outside of abortion clinics with a flyer saying, in big letters, Please Let Me Adopt Your Baby! (The letters have to be big because the young girl is going to assume that you're chastising her for having an abortion, so she's only going to glance at the flyer.) Maybe have your husband there to, and he can carry a big sign that says the same thing.
The saddest part of this whole abortion thing is that every single one of those babies could be adopted by church families IN A HEARTBEAT, yet nobody knows this because the mainstream media is anti-church and pro-abortion, so they'll never show that news.