How much wood could a woodchuck chuck

Okay my take is this (also wait for more season folks in ETF business to comment):

- Look at the ETF offerings in their company website. You can look at their holds, turnover, historical performance to gauge how the manager sort of views the market. (OW/UW sectors/subsectors, investment horizon). I think ETFs have quarterly disclosure requirement on their short positions (I've seen some ETFs track some benchmark while shorting collars to have the premium generate alpha over their benchmark) so look out for these. 

- Whether or not they are equities or fixed income matter less at this point I guess. Know how to read financial statements and three statement interactions. Like the basic stuff on IB prep materials should help you on this end. I feel you look at similar metrics on 10-Ks and 10-Qs in both equities and fixed income, just the perspective is different (FI will look at yield curves and sector curves and their spreads and duration and the fixed income offering based on their views on the aforementioned data, equities will look at strength of the end market potential, competition, externalities - both will look at balance sheet strength and financial flexibility). Also, some managers take into considerations for whether the industry or the company management lean towards shareholder returns versus servicing their creditors. 

- For the interview:

• Financial statements and the link between them
• Modelling questions
• Pitching a stock or two
• Macro view (your answer should sort of cater to what you see in their ETF holdings and turnovers)
• Your story, why you, why this firm