Dad put ceramic and sponges from his filtrations into mine, the bogwood and plants are new and dad said 3 kribs are better than 2 for starting the cycle.
This is where the hard work begins, to try to keep these 3 fish alive, so I'll be keeping my fingers very tightly crossed for them. Don't forget that you will absolutely have to do daily water changes - as you don't have a test kit, it will be impossible to know how much (whether 10% or 50%) but I'd advise at least 25% of the water will need replaced daily with dechlorinated water. Keep this up every single day until at least the end of April - don't miss a day! (It might be possible that the tank is cycled fully before that, but, without a test kit, you'll not know, so better to be safe than sorry and continue until the end of April at least.)
Ordinarily, I'd advise other measures as well, such as using Seachem Prime as your dechlorinator and which helps detoxify the effects of ammonia and nitrite on the fish, making it less hazardous and painful for them, and possibly Tetra Safestart which might help and speed up the cycling process. However, as you've mentioned not being able to afford these, this will mean being very, very careful to make sure that you keep up the daily water changes. Two 25% water changes per day would be better than one - so try to do that morning and evening if at all possible.
Best of luck. Everyone on here will no doubt be keeping fingers and toes tightly crossed for your 3 kribs, in much the same way as they would if you were adopting a dog and keeping it in a straitjacket inside a cardboard box for some time ie hoping desperately that it survives the process and comes out unscathed afterwards.

Keep us posted on how things are going, and also on your thoughts/plans for May onwards once the cycling process is hopefully completed - we'll be happy to advise on which fish are or aren't suitable. Try not to get your heart set on any particular type of fish too soon - have a think, take a look at the Fish Profiles on this website, check them against the similar profiles on Seriously Fish website, and see if they're suitable for your tank size and water hardness, then let us know what you're thinking of. We can then advise whether that is a good or bad idea, and, once it looks as though there are some fish that would live happily in your tank, you can then start to enjoy looking forward to getting them. [When I first started tropical fishkeeping, I went to look at fish in the local fish shop, and got quite excited by guppies, mollies and platies; however, I started researching on this website, and soon learned that they would not be at all suitable for my very soft water, so I had to have a big rethink. Once I found which fish were suitable for my very soft water and my small tank, I only looked for those types of fish in the shops. It's wonderful to watch how happy, well-coloured and healthy these fish are now - and it certainly beats the pain of watching an ill/injured or dying fish which would have happened if I'd got unsuitable fish, as well as saving me lots of money buying replacement fish or extra medicines to treat them.]
I'd better sign off from this long posting otherwise you'll fall asleep and might forget to do a water change

. All the best.