Good job! I personally think a halter should be use for the first bit -whether on it's own or in tandem with the bridal, since the horse won't fully understand what the bit is for anyway. More gentle on them I guess.
I don't think the boots are necessary at this point, but good practise to get them to stand while putting them on and off. In the sand arena you're in at the moment I don't forsee her getting jabbed by anything, but the trails can be unforgiving, especially when they're not cleared. I like SMB's but don't see a purpose for polo's other than protection from twigs, I don't see a little piece of fabric holding a tendon in place during hard work...if it's going to bow, a polo wrap won't prevent it.