I'm unmarried. I want to marry a Shia Muallimah & want to settled internationally, but it's challenging to me- what should I do about it? and may I expect any help? Mostly financial issue, and no support from anywhere.

Follow this Ayah inshallah Allah will fulfil your Hajaat.
But you must have firm believe in Allah (swt).
وَأَنكِحُوا الْأَيَامَىٰ مِنكُمْ وَالصَّالِحِينَ مِنْ عِبَادِكُمْ وَإِمَائِكُمْ إِن يَكُونُوا فُقَرَاءَ يُغْنِهِمُ اللَّهُ مِن فَضْلِهِ وَاللَّهُ وَاسِعٌ عَلِيمٌ

And marry those among you who are single and those who are fit among your male slaves and your female slaves; if they are needy, Allah will make them free from want out of His grace; and Allah is Ample-giving, Knowing.(24:32)

If it’s in your favour Allah (swt) will open all His blessing upon you.