I apologize in advance for what I suspect will be a rather disappointing and perhaps useless response, but it is really the best I have to offer.
I can't actually think of anything I'd call tips to offer because I don't really think of sugaring in general or meeting and getting to know potential SBs as some sort of special activity or skill that requires learning techniques etc. Perhaps you want an SD whose perspective on the sugar bowl is somewhat like
@Sinapse's (and other self-styled PUAs, but I mention him because he is the only active TAG PUA who offers/sells training afaik) perspective on picking up women.
Basically, when I first meet a potential SB in some social situation, it is the same as first meeting anyone else I want to get to know better (a conventional date, a professional colleague, a new neighbor, someone sitting next to me on a long flight). There are maybe four typical elements in such conversations:
1 - asking the other person general background questions about themselves and listening to the answers
2 - offering similar information about oneself, ideally in response to their questions
3 - talking about some topic of mutual interest (travel, politics, sports, movies, music...) if you can identify any such without too much effort
4 - discussing the specific context in which and/or reasons why you are meeting
Only #4 is closely tied to the sugar context obviously. On this topic I tend to be very direct and honest in a polite and respectful way...but that is just my usual style of communicating on any topic. People say it is better to be indirect with Japanese people, but I haven't found it to be a major problem to be quite direct. If they are cosmopolitan enough to date a gaijin, they are probably cosmopolitan enough to understand and accept a non-Japanese style of discussing a topic.
The sugar context also has some implications for #1 and #2 in that people often don't feel comfortable revealing their real identities at the beginning of a sugar connection, so you sometimes have to steer around topics which would be major clues in that regard.
Only one other comment on your specific situation, you said that you have already agreed on the financial sugar; it seems to me that you should also discuss the physical/intimacy and emotional sugar equally openly and freely.
Again, I'm sorry that this is probably almost no help.
-Ww
