Non-pros and average rate
Considering the fact that you are 46 years old (I'm 52), one of the best place to meet non-pros garotas is 3P4 (Três por Quatro) in Itaim Bibi.
[url]http://www.3p4.com.br/[/url]
There are other good venues like
Piratinga (149, rue Wizard in Vila madalena),
Cahsmere (679, rua Henrique Schaumann, Pinheiros)
Pirasá (64, avenida Brigadeiro Faria, Jardin)
Flirting is « paquerar » in Portuguese. Do a Google search with São Paulo and paquerar, and you'll come up with an array of answers.
One of my favorite spot for non-pro is Bourbon Street (a jazz club) in Moema.
Considering garotas de programa never pay more than $R200. Unfortunately for you, all the girls I know are Portuguese monolingual.
You can always try Patricia Kimberly because, if I'm not mistaken, she can speak English.
The only garota I know who speaks fluently English (and Italian and Spanish) is Bella. As she is not my physical type I cannot vouch for her. I spend some time with her in private parties, I can tell you that she is very clever and entertaining. (I don't what are her rates but as far as I remember there a little bit higher, around R$200-R$300). I'll try to confirm this later perusing national forums. By the way, she's in her late 30's (with kids).
[url]http://www.malybu.com.br/acompanhante.php?garota=68[/url]