FIBER -- ethernet switch

I am looking to replace my 10+ year old switches
with openBox/offLease/or new equipment.

1.      What 24 port non POE managed ethernet switch with two fiber
        ports do you recommend since I need about 10 switches ?

2.      What is the best way to see what ROUTE my FIBER is actually
        taking to confirm the below layout  (i.e. do TRACERT, etc) ?
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Layout
1.      Current Fiber Wiring
         a.      siecor optical cable 62.5  / 125 micron
         b.      type DFNR (UL)
         c.      type OFN FT4 (CSA)
         d.      4,300 feet
         e.      I assume multi-mode ?
2.      20MB fiber into Dell SonicWall
3.      switch in building #1
         a.      CAD5e out to employees in building #1
         b.      FIBER out to building #2
4.      switch in building #2
         a.      CAD5e out to employees in building #2
         b.      FIBER out to building #3 (which is behind building #1)
5.      switch in building #3
         a.      CAD5e out to employees in building #3
6.      switch in building #4
         a.      CAD5e out to employees in building #4
         b.      FIBER out to building #5 (which is behind building #4)
7.      etc