Well, you do not have to show big money. You just have to meet the poverty guidelines depending on how many dependents you have. If your mother is not in the US right now, you do not need to even file the affidavit of support at this point. If the process is not clear, you might want to use a lawyer not to complicate it for you. Also if you do not meet the poverty guidelines, you can also have a joint sponsor.
Founder and Managing Attorney of Shah Peerally Law Group PC
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With your income you should have no problem showing that you can provide for your mother. The initial step is filing the I-130 here in the US. After that is approved then your mother will be able to obtain her green card at the consulate in her home country. It is important that you maintain your employment and file taxes every year. It would be wise to consult an attorney.
Alexus Sham, Esq.