First time doing speed because I can't sleep so why not stay up all night. Cheers Tesco - need advice too

Cut it up finer than this into powder before snorting. Just found it funny I was doing speed off a clubcard so had to grab myself a pic.

How long do I wait to know if I need more? Finished my line at 1.20am (20 mins ago) and it's now 1.38am (took it in two parts, dampened my nostrils before with a wet cotton bud and held them closed after. Used a blade to cut it down to fine powder because of the chunks, cut into lines then sorted a little up a dampened nostril with rolled up paper because no straw or tube or anything I can find rn then I held my nostrils closed and didn't let any drip out.

Already a 2mg bar of whatever was in that Xanax I posted yesterday 3 hours and 25+ min ago (didn't hit hard at all today, so I took 1mg normal alpraz and 4mg clonaz at 10.37pm (3 hours ago) but just got a light high then tired. But couldn't sleep. Had 5mg ambien and 25mg promethazine X2 tonight for nausea and then sleep. That failed so stims it is.

So yeah already got another line prepped. Got a gram total but I want to ideally save some for a gig soon so how long do I wait to see effects from this first line and when do I realise if I need to redose?

Second post is how much I've got left. One bigger line racked up ready to go and whatevers left of that gram in the baggie (got no drug scales). Also gonna snort the tiny bits I spilled on the bin lid and bedside table. First time using stimps properly (gummed just over a bump worth of coke before that's it), speed is a first for me. Also I have ADHD if that's relevant apparently it can be with stims.

TLDR when do I redose did I do enough am I doing it right