Not marry yet apply for Non-Business visas, or Non-B.
An alternative option is to apply for a Non-O visa after marrying a Thai wife, which will allow you to obtain a work permit and legally work or open a business in Thailand ka.
From my experiences, choose a course you are interested in that is supported by an institution and has a physical location (not an online course). The course should be at least 6 months long.
After applying, then submit the necessary documents from the school to apply for your visa. Once your visa is approved, you can finalize your study plans later.
You can extend this period by an additional 180 days, effectively allowing a continuous stay of nearly one year without leaving the country , cost 1,900 ฿ (no need to proof fund again)
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