Honestly, in view of your tight finances, I would take the Americorps job if offered.
However, once you have been offered a job, you can ask for a couple days to think about it, and in that time, contact the other jobs to let them know you have an offer.
And I do recommend taking a couple days before accepting the offer, if they agree to hold it. At that point, factor in cost of living, relocation, ask for complete information about the health plan, and so on.
You have had SO MUCH TROUBLE due to low finances, not the least of the problems being having to rely on your unreliable relatives, that I think this is a time to stabilize your lifestyle in a healthy direction, before planning strategic career moves. You can always apply to more attractive jobs in a year or two.
Don't take my word for it, research it yourself, but I imagine that Indiana is a relatively low cost-of-living state.
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A finger in every pie.