After months of on-again, off-again conversations with potential backers, his new firm, Section 32, has completed its first fund with about $150 million. Last year, 22 new firms raised a total of $2.2 billion for their first funds, the highest amount since 2008, according to the National Venture Capital Association, a trade group. Section 32 — a “Star Trek” reference — will invest in technology startups, partly with a focus on life sciences and biotech. Microsoft announced Tuesday that it...