Some vendors will throw in 1 or 2 10mil. bottles with a starter kit, but regardless you will need more than 20mil. of
juice plus you'll want to try at least 6 different flavours in the start to try and narrow down what types you like most.
ie. fruity, bakery, tobacco flavours.
To do this you may need to find a supplier that mainly deals in juice.
Most have 3-5mil. sample sizes for under 5 bucks each.
I went and bought large 30ml. bottles of tobacco flavours when I started and they are mostly still sitting here 1 year later.
They cost me over a hundred bucks, don't do that!
In the end the sample sizes are best to start. If you find one or two you really really like then order some 30ml. botts.
You'll be surprised how far 10mls. of juice will last you.
I vape mainly vanillas of different variations but also mix my own for even greater savings.(and satisfaction)
In the beginning though better for you to try store bought liquids to find the ones/types you like.
I too was very anxious to get up and running at the start but a little homework in the beginning will reap great benefits as far as finding what suits you best both in liquids and equipment. Everyone is anxious and overwhelmed to begin with.
Watch utube vids on the products you're interested in and learn what you can before dropping any coin.
Up front costs can be a little high but compared to a 2 or 3 month smoking budget really isn't too bad considering once you're set up the hardware should last for many months.
The replacement coils/heads generally cost between 1.50-3.00 and will last 1 week to a couple months each.