OK.
2.I-94
both of yours
3.Copy of Passport
Both of yours
4.Copy Receipt from Immigration for status change to H4
OK.
5.Copy Receipt from Immigration for status change to H1-B (wife)
OK.
6.Proof of funding
OK.
7.I-20 Orignial
OK.
Additional:
8. Marriage certificate
9. H-1B pay stubs (at least recent 3 months)
It seems late to get F-1 in US in three months, suggest to get F-1 in the third country. No F-1, no TA, you know!!