Welcome, drtyshwa420! Here is a forum dedicated to your style of PV:
M-401/402 "Mini" & M403 Super Mini
Once you get more than 15 posts you can post questions there. Just say hi to a bunch of people in New Members and this will give you your posts.
DIY is great, and certainly cheaper than buying premade juices. If you have bought several juices of various strengths, maybe some PG and VG juices to know what you like and what vapes and tastes good, then you could be ready for some DIY. $150 is a lot to get started. I would get one of these kits to start out with:
DIY MIXING KITS
Then save the remaining money for what you might need after you get your feet, and atty, wet! You may decide over the long run that you want to try another PV type, or get bulk nic
juice, or whatever. DIY has a fairly large learning curve, so get 3 mL bottles for testing amounts. Expect to have many failures in the beginning, but its lots of fun, and so great to make your own favorite juices.
Here is the DIY forum for future researching and questions you might have:
DIY e-liquid
Rule #1: high-nic juice, like 48 mg or higher, is quite dangerous. Start with 36 mg to learn how to use your hands and get a bunch of practice before getting really high-nic. I do not recommend making a few juices, and then buying a liter of 100 mg unflavored in the beginning, even if the price is good. I'm a chemist by profession, and I worked with 36 mg for months before buying higher nic, since even for a chemist DIY in the beginning is MESSY.
Do some serious reading of the stickies in the DIY forum. Make sure you have a safe lockable place for storage and DIY mixing if you have pets or kids. Nitrile gloves, such as ones you can get from a med supply place or pharmacy, are a must. I like bounty select-a-size paper towels...you will go through lots of them, especially when starting out.
Cheap plastic dropper bottles can be gotten from USPlastics.com. PV vendors generally charge too much for bottles. A couple 3 mL and 12 mL syringes are also quite useful. I recommend syringes for accuracy, since drops can vary in size from liquid to liquid.
This should get you started, but I would commit to a good week of researching before jumping in. There are many many things that will not have occurred to you as you read and learn here.
Good luck!