I used a Blu starter kit up until a couple of months ago. My first step was to get an Ego starter kit. One nice thing I was able to use up my leftover Blu cartridges by just screwing onto the Ego battery, although they didn't last long and tasted burnt withina couple of hours, probably because the Ego battery puts out more volts. I am now using an Ego Twist, which allows you to dial the voltage up or down, fine-tuning the flavor, vapor, throat hit, vapor temperature of your vape. I would definitely recommend an Ego Twist battery.
As for what you put on the battery, lots of folks here will give you different opinions, all worthwhile. My experience was first with the atomizer and cartridges that came with my starter kit. The cartridges were worthless, terrible to re-fill, leaked, had a filler taste, and the filler would burn. I started to drip my ejuice straight onto my atomizer with an empty cartridge attached, and fell in love with flavor. I still drip whenever I can. For on the go, I use a mini Vivi Nova. It holds 2ml of juice, which lasts me almost a day. The mini screws right onto the battery and is small enough that it sits flush with the Ego battery.
Finally, as for juice, I am still experimenting. I liked the Pina Colada and Cherry Blu cartridges, but found I don't like the fruit flavors I've been trying, I prefer the sweeter, creamier flavors that Blu doesn't have. I smoked half a pack a day and started with 24 mg ejuice, which was way too much for me. I would get headaches and nauseous, but it would probably be OK for you if you were 2-3 PAD.
It's a journey and you'll spend lots of time and money experimenting, but you'll have lots of resources here, so ask away.
