These represent flavors to target 1st on your mixing journey. They play well with others and are proven (for me). I get flavors mostly from BullCity. Flavor Express, OOO, VSO directly from them. 

Bases: VG from glycerine suppliers. PG from Bullcity (when in stock) or from Glycerin Suppliers. I prefer the PG from bull city, it's smoother to me.

Nicotine: As of this writing Perfect Vape is still selling 100mg/ml Nic Select to consumers in VG or PG. Another option is Nude. max VG or max PG is a personal choice. In my own testing I prefer VG. Amber Glass bottle with polycone caps for long term storage of nicotine. I use 120ml amber because I dispense from a 120ml bottle. I don't like to keep opening, defrosting and then refreezing larger bottles.

Scale: LB-501 on Amazon. https://www.amazon.com/American-Weigh-Scales-LB-501-Digital/dp/B005UGBG20

Bottles: 30ml, 60ml, 120ml, 200ml Yorkers by Trendbox on amazon. I use these for testing mixes and batching one shots. Also for dispensing bases. 120s for Nic, 500ml for PG and 1L VG. This style is less messy and easier to use than twist tops and easier to get into to adjust your mixes on the fly. Just type TRENDBOX PLASTIC BOTTLES into Amazon. The larger ones (500ml / 1L) you just have to search for. These are the ones that hair stylist use for dispensing hair coloring. Protip: use your snips to cut the tip on the one you use for VG, helps go faster.

60ml and 120ml chubbies for finished products from Bullcity.
For "finished" labels Avery Weatherproof 2x3 white film #94237 and a laser printer. these have held up better than anything I have used. I only print black and white but you can spend the money and get a color laser. The toner carts are expensive but last WAY longer than ink jet.

Misc:
Clear packing tape over sharpie to label bottles. No need to get paper labels (they suck).
Lots of paper towels.
Hand Sanitizer (you will get sticky).
Racks: I really like these from Amazon. https://www.amazon.com/gp/product/B08CC3HXGQ/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1