You can keep the plants in clear plastic containers with some tank water and put them on a window sill or some place where they will get light.
I see that you are in the UK so you will probably find Hagen Nutrafin kits the easiest at the LFS. Hagen Nutrafin has a mini master kit that comes with ammonia, nitrite, nitrate and ph kits, they are around $30 in the US, not sure on UK pricing, initially the price may seem higher then using test strips, but in the long run it is cheaper the cost per test is much cheaper with liquid test kits. You may also be able to find Saliferts test fairly easily in the UK, but they don't have a kit so you will need to buy each test separately. Saliferts is very expensive in the US, but from my understanding much cheaper in the UK. There is also API (also has a master kit available), they are generally the cheapest and easiest to find in the US, but again, I hear the API kits are the most expensive in the US. But any of those brands will work well for you. I will let someone from the UK give you a better approximation of cost. When you get your test kit, test your tap water as well that way you will know what you are starting out with in terms of pH, nitrates and nitrates. Every water source is different, but it is a good idea to know what you are starting out with just as a reference point. Also if there is something really off with your tap water you can try to deal with it before it goes into your tank.
You can cycle your tank with the lights off, and is better that way you won't (or shouldn't) get as much algae buildup. I did mine with the lights off still got algae, but hardly any at all.
I see that you are in the UK so you will probably find Hagen Nutrafin kits the easiest at the LFS. Hagen Nutrafin has a mini master kit that comes with ammonia, nitrite, nitrate and ph kits, they are around $30 in the US, not sure on UK pricing, initially the price may seem higher then using test strips, but in the long run it is cheaper the cost per test is much cheaper with liquid test kits. You may also be able to find Saliferts test fairly easily in the UK, but they don't have a kit so you will need to buy each test separately. Saliferts is very expensive in the US, but from my understanding much cheaper in the UK. There is also API (also has a master kit available), they are generally the cheapest and easiest to find in the US, but again, I hear the API kits are the most expensive in the US. But any of those brands will work well for you. I will let someone from the UK give you a better approximation of cost. When you get your test kit, test your tap water as well that way you will know what you are starting out with in terms of pH, nitrates and nitrates. Every water source is different, but it is a good idea to know what you are starting out with just as a reference point. Also if there is something really off with your tap water you can try to deal with it before it goes into your tank.
You can cycle your tank with the lights off, and is better that way you won't (or shouldn't) get as much algae buildup. I did mine with the lights off still got algae, but hardly any at all.
/www.fishforums.net/index.php?/topic/315183-liquid-test-kits-how-to-perform-and-read-tests/page__p__2611010__hl__liquid%20test%20kits__fromsearch__1&#entry2611010