Hiya, Kath - think it's fab you're going to so much effort with the stickies (even though you're not the biggest fan!)
The good news is that Indian (or 'laboratory') stick insects are ideal for beginners. They love privet, ivy and bramble, so are nice and simple to feed (bramble seems to make them more active, apparently!). Like another poster said, lightly mist the leaves every other day so they can have a drink. This is the only care they need food and water-wise.
For accommodation, stick insects need their housing to be tall - around 45cm high. This is so there is enough room for them to slide vertically out of their skin when they grow. So yep, I would recommend turning the fish tank on its side. You say you're using netting, so the stickies' ventilation requirements sound as if they're being met. All the accommodation needs is for you to clean out the poop and replace the leaves around once a week.
Stick insects are mostly nocturnal, so don't worry about them not moving around much. And if they're pooping, they're eating

. No need to get any more - two stick insects are fine.
When fully grown, Indian stick insects reach about 10cm in length. At this point, they will start laying eggs (no male is required for this). They usually lay several eggs per day, so you'll need to go through the poop and separate the eggs (they're round/oval with a little nubbin on the top) - you can incubate the eggs for more stick insects in a closed container and they should hatch after 4 months. If you want to get rid of them, don't throw them in the bin where they could hatch

- freeze them for around a week first.
Hope this helps!
Poppy (phasmid-fan).