| Teupokoles |
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The 'Which one goes when' is neatly solve by the line in the summon monster spell that read 'It appears where you designate and acts immediately, on your turn.'.
So they all act at the same time, even if you spend several turns in a row summoning more and more.
I generally refrain from having more that one summon spell running at a time, so as to not take up too much time at the table... Besides there's the fact that a well-built summoner can easily match an entire party for power, so a certain amount of being your own judge on limits is usually prudent.
With it being a construct casting a 2nd-level summon spell, I'm assuming that your characters level is quite a bit higher than that of the 3rd-level wizard that would usually cast this spell so the power level consideration isn't as relevant.
Consider playing them the same way that a GM would a horde fight. Since they all act at the same time, you can first move all of them and then roll a massive handful of d20s for all of their attacks at the same time. If the GM is willing to simply tell you the opponents AC then it's pretty quick to sort through how many hits you get, if he won't tell you then just ask in descending order if your hits land and you'll pretty quickly be able to work out what rolls go in and what don't.
With the low level of the summoning spell the creatures will quickly, if not already, devolve into just being HP bags to absorb a single attack each, obstacles that make enemies charges difficult and flanking buddies for the party, all of which are great uses of them since your not the one using actions to cast them.
Getting good at moving them quickly, rolling all of their attacks at the same time and maybe even just having them die immediately when they take any real damage so that you don't have to keep track of their remaining HP, are the keys to not being too annoying as a summoner of tons of low-level creatures. You ought to only ever summon one type of creature at a time too... It gets confusing if you have four different types of summons at the same time, faster to just summon 12 of the same creature so that you can do all the rolls at the same time.