best bet would be to call your vet...
i have reacently sent home a litter of 4 chi pups, my vet doesnt like to give the first set of shot on such little dogs untill 8 weeks (which i agree with)
for a litter of 4 it cost me $48 for the dewclaws done at 3 days (it might be more for you as minpins usually have the tail docked, but you dont HAVE to especially since these pups should be going home spay/neuter), and $160 alltogether for the pups to have their checkup and first shots at 8 weeks old.
this is in CT so it could be cheaper where you are as ct is typiclaly expensive.
We were also unlucky and my female had to have a c-section and emergency spay which cost $2000, id say try and put $3000 for everything including a just in case emergency like a c-section.
i would also think about getting intouch with the aspca and reporting them and mabe getting the low cost spay/neuter van down there...
for the most part though if she has an easy delivery, your not going to have to do much! make sure she feeds them about every 2 hours for the first couple of weeks, keep em warm and out of drafts and at 3 weeks start intoducing puppy mush (Puppy milk replacer alone on a plate at first then slowly adding more and more solid matter presoaked ground up kibble is perfect for that) they should be weaned around 6-7 weeks and can head to their new homes at 8 weeks (toy breeds should stay longer if possible, i sent the chi pups home at 10 weeks and one is staying till just under 12 weeks at her new owners request due to some things going on at the house. but since this is more of a Charity case, they can go home at 8 weeks if you want them too!
hoep this helps!
since youve never given pups shots before (and toy/small breeds are prone to bad reactions), id just shell out the little extra and have the vet do it...