Can you use a higher gauge lets say .009 for E and .012 for B? or are these only for E?

I'm luthier. I design and build custom acoustic guitars. I also repair acoustic and electric guitars and restore historical guitars. Yes, you can use a higher guitar string gauge, to a certain point. You don't want to use huge strings on a guitar not designed for huge strings. With respect to asking if you could use a .009 for E and .012 for B, it depends. An electric guitar uses smaller strings. So, yes to an electric, no for an acoustic. .009 and .012 are too light for acoustic high E and B. General rule of thumb is to use the strings in the capacity for which they've been designed.

For an acoustic guitar, what size would be good for a high e string?

I am assuming that you are referring to a steel string acoustic. Even then it depends upon the sound you want and the action you prefer. For the average steel string acoustic with "light gage strings, I would most likely choose a string of .010 in. If that seems to heavy, or the action seems to heavy, you could use a string of .009 in., or if you want a heavier tone (and action) you could try a .011 in string. I know that this did not help you much, but I could suggest that you check the sizes of that high E string on the packages of several reputable string companies, and see what they use. You might get a better idea from that. Best wishes in your effort.

How do you what strings you need on a squier?

The same set of strings you use on any other electric guitar. You can use extra light, light, medium or the heavy set (1-6 strings) of strings depends on how hard you want to play. If you’re a beginner you may want to start on extra light (.009) high E set of strings.

String Material Type	Alloy Steel
Color	Silver
String Gauge	Extra Light

20-Pack Economy Single Acoustic Guitar Strings Bulk .010 High E (Extra Light) 10 Gauge, Individual Packed

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