How big are you? The 3.5 might be light depending on board your weight and what you ride on. I have an old flexdeck I used to use and am 230 pounds I learned with a Beamer tsr 3.5 and on the firm sand it wasn't enough.
The blade would be good for light wind days likely just be careful. I use a cooper 4.7 and Razer 5.5 in 10 km or less. Both are high aspect kites and will try to fold in half if you are not watching them carefully. Race kites are the only answer in light winds but they are a handful!
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About 170 i feel like the 3.5 could lift me a good bit however I just cant get the redirecting down