1. His eyes glanced recklessly about him, greedy fro the last sweet pleasures.
His eyes glanced (looked quickly) recklessly (very fast, not thinking about what he was looking at), greedy (wanting very much) for the last sweet pleasures (wanting very much to see (or get) all the good things that were around him.)
He looked around fast, and with hunger, wanting to see and get the last happy things that were still there.
2. Once he had slipped in and set up his stand no arguments could make him
When talking to people, he would decide what he believed about a subject before anyone else knew he was thinking about it... when he made that decision about what he believed, no matter what anyone else said, he would not change his mind, even a little bit.
Once he had slipped in (slipped in = did something before anyone else knows you are doing it) and set up his stand (set up = decided, thought up, figured out, his stand = his opinion, his position, his idea) no arguements could make him budge (budge = move, change, even a little bit.)