Welcome to ASF! 200mg split into 2 100mg shots is a TRT dosage so don't expect anything crazy from it unless you currently have low testosterone in which case this will really help you. In the event you're wanting to run a testosterone cycle dosage then I'd up that to 400mg split into two 200mg shots.
As for pins Amazon is fine. I'm a pin snob and like a certain brand so I order mine from this site that I'll link below. I personally draw the oil up with a 21g 1 inch. I do my injections with 25g 1 inch or 1.5 inch. Rather or not you go 1 or 1.5 inch depends on how much body fat you have. Unless you're really lean I'd suggest just going with the 1.5 inch.
I like Exel syringes and I get them with a 21g on them then I switch thar off to a 25g. The brand I like the most for needles is easy touch. These brands are just my personal preference though and you can decide later what brand you like. Also there are SO many websites you can order pins from. This is just the one I've used lately.
If I can be of any help to you please feel free to reach out
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