Will my past misdemeanor charges affect my application for a retirement visa in Thailand?

Have more then 10 years felony, and have never had a problem traveling internationally.

You need a Non-Imm O visa applied before entering Thailand. Then few days after your arrival, go to local immigration to ask further information what you need to prep during your 60 days + 30 days extension on your non-imm O visa. It is also for your BEST INTEREST to IMMEDIATELY go to the bank(s) and open up a saving account, deposit a sum of $$$ as recommended by your Immigration Officer (400k baht for marriage-based visa & 800k for retirement, seasoned and untouched for 2 months).

A Tourist Visa will do you NOTHING but sightseeing and leave the country safely. Some local agency might be able to help you to "convert" your Tourist Visa for a fee equivalent of a roundtrip ticket business class from wherever your origin is.

Will not effect a non O, but DO NOT come on a tourist visa which is 60 days, not 90. Apply for the non O from home.

You have no issue... There are no background checks

You’ll pay an Agent 65-85k to get it all done just get the non-o at home get here open a bank account and get your 800k in it and I know nobody wants to put that in a Thai bank so if that’s the reason then pay if you like but if you don’t have the funds don’t even bother retiring here if your short

Go online to the Thai evisa website. It will ask you to choose the Thai Embassy in Washington DC, OR whichever Thai consulate responsible for the area where you live. Fill out the application for the retirement Non-Immigrant O visa, which provides a single entry and permission to stay for 90 days. Arrive in Thailand, go to Kasikorn Bank (do NOT go to Bangkok Bank) with the necessary paperwork and open your bank account. If you have the money and the luxury to set it aside for a while, I recommend opening two bank accounts: a personal savings account for day to day expenses and a fixed deposit account to do two things: secure a credit card and hold the 800K baht required to apply for the 1 year extension of your 90 day Non Immigrant O visa. Get the extension and live happily ever after or at least until you have to make your first 90 days report and, later, apply for the annual extension. By the way, I recommend applying for the Non-Immigrant O-A visa, the one that requires the FBI criminal background check. It is multiple entry and has an initial term of a year. Ask a Thai immigration lawyer about the misdemeanors.

Charges or convictions there’s a difference. I was charged with selling stolen firearms arm but the charges were dismissed.

Did it happen in the county you are currently living in? If no then you could get a clearance from a county level!

Only the Non-O will help you to open a bank account. NOT the tourist visa.

Your confused. You should get the non-O visa before you arrive.. that's the retirement visa.

There is no background check involved with the non-O visa.

Your plan truly makes no sense though. Why would you buy a tourist visa to arrive and then pay hundreds of dollars to get the non-O visa from an agent? You can just apply for the non-O visa online, and then if you want to use an agent for the extension, it will be SIGNIFICANTLY cheaper since you are already on non-immigrant status.