Congrats - we adopted our oldest - he's nineteen now. We have a second "surprise" kid following right behind that is going off to college next year.
Your child costs are going to dwarf your adoption costs very quickly. Especially if you currently do not have kids. Childcare or the loss of income to stay home, diapers and formula for a newborn - if you don't have someone who will watch an infant for free or cheap, plan on $30k the first year MINIMUM. And that is the first year costs - they get a little cheaper as they get out of diapers and formula and into school, but the long term costs of having kids - from fees for sports/music lessons/dance to car insurance to an extra plane ticket for vacation to college costs - will be huge. So look at saving for the adoption as a test to see if you can really do it (and, to speak rather bluntly for a second - that you really WANT to do it, the financial sacrifices you will make will be the smallest you make to raise kids, if you resent them, you can (and should) back out). Its an advantage adoptive families get that you don't tend to get when you create your family in the more traditional manner. And trust me, people sneer at a parent's GoFundMe campaign to pay their kids soccer fees, band trip or prom expenses - and nearly every even vaguely middle class parent is shocked to find out how little money is available for college when they hit that stage.
Right now you have something you will not have with a younger child in the house - time. Get a second job....working sixteen hour days and not having weekends is the norm for parents. Money you make in excess of the adoption costs while waiting for placement can be set aside to cover all those expenses you are about to add when you don't have time for a second job.