U R Gud2Go!
Hey,
With my knowledge, I am sure you are hassle free to get H4 visa for your wife as you are still in Pakistan. And better go for this, consult your employer before you make this decision. Hopefully things go favourable to you. But as I said do all paper works for you like enrolling your name in her passport, and getting the marriage certifiacate, showing your marriage pictures where you and your wife were involved in Rituals (Marriage customs) and group of people involved etc. And Ha, carry all papers like employer letter, marriage hall bill, if you have had given Paper ad for your marriage to prove your marrige is genuine. I guess this is all. But wait for some more posts, patience is important here ok. God bless you.
P.S.
And now appointments are going on such a way to book very advance.
Check online on which date they are available. If it is in next month or so, better wait till then get stamped before you leave to US. I dont know whats your condition will be when you arrive US., later there will hell lot of things to provide so better stay and get her visa stamped then come. But this is just an advise use your own justification. Talk to your employer and other known people they will guide even better I guess.
Mohanakrishna.