@Chiisaiinu, I pour my nic base into bottles from a 240ml LDPE bottle with a twist cap. You might want to consider getting some 120ml or 240ml LDPE bottles and a few twist caps for those. They help to make mixing more efficient.
I mix by weight. https://www.reddit.com/r/DIY_eJuice/comments/2iq3km/botboy141_guide_to_mixing_by_weight/
For a scale I use the American Weigh Scales SC-501. https://www.amazon.com/American-Weigh-Scales-LB-501-Digital/dp/B005UGBG20/

There are many decent scales available. The most important thing to know when buying a scale for DIY is getting one that can weigh down to 0.01g.
For mixing I use the Badger Air-Brush Co. 121 Paint Mixer. https://www.amazon.com/Badger-Air-Brush-Co-121-Paint/dp/B000BROV02

I use it for 1-2 minutes then cap the mix and put it away to steep.
I'm not familiar with the magnetic mixer you have. If it is anything like the mixer I use then up to two minutes should work fine. If after 1-2 minutes your mix is getting cloudy, you're 100% set. The cloudiness will clear up after 10-15 minutes.
I mix by weight. https://www.reddit.com/r/DIY_eJuice/comments/2iq3km/botboy141_guide_to_mixing_by_weight/
For a scale I use the American Weigh Scales SC-501. https://www.amazon.com/American-Weigh-Scales-LB-501-Digital/dp/B005UGBG20/

There are many decent scales available. The most important thing to know when buying a scale for DIY is getting one that can weigh down to 0.01g.
For mixing I use the Badger Air-Brush Co. 121 Paint Mixer. https://www.amazon.com/Badger-Air-Brush-Co-121-Paint/dp/B000BROV02

I use it for 1-2 minutes then cap the mix and put it away to steep.
I'm not familiar with the magnetic mixer you have. If it is anything like the mixer I use then up to two minutes should work fine. If after 1-2 minutes your mix is getting cloudy, you're 100% set. The cloudiness will clear up after 10-15 minutes.