I kinda wanna read his stuff in order is possible, though I'm sort of dependent on what my library has available. After being introduced to Stranger and Starship Troopers by secondary sources, I started with Puppet Masters, Double Star, and Door into Summer, and then read one of his juveniles. Other ones of his I own I've randomly collected at rummage sales are Revolt in 2100, Methusaleh's Children, The Moon is a Harsh Mistress, The Star Beast, and Time Enough for Love. Not sure what I'll read next.
"if possible" :)