What do you need?
Obviously you need ukuleles and if you click HERE there is information about what ukuleles, funding, where to buy etc.
We started very small, I persuaded our management to purchase 5 instruments and as a department we bought a further 3, so we had 8 school ukuleles. It was a start! As the ukulele can be a relatively inexpensive instrument to buy (especially for beginners), many of our pupils very quickly got their own instruments too.
You need players. For us it was a small mixture of pupils and staff, some could play a few chords, others were absolute beginners. Some of the pupils (and all staff) had their own instruments so we weren't restricted to only the school instruments.
You need music to play and resources to enable the music making. This could be printed sheets with chords and lyrics or technology eg. a projector with PDFs or youTube videos. There is a huge amount of FREE resources out there. Check out the various YouTube channels featuring ukulele lessons, tutorials, play along videos etc. and the different education ukulele websites on the Resources page.
You need enthusiasm. There will (hopefully) be a degree of excitement about your new project but if you can add your very own energy and enthusiasm into the mix,it really will make a difference. The ukulele is such a fun instrument and if you can get this across it will pay dividends. Naming our school club "The Ukulaliens" was part of the initial success and gave a sense of "belonging" to something. We also run a rewards scheme - each player is given a small wooden keyring and they add coloured beads to show their progress - again, this was a big part of the initial success of the group when everyone was starting out. After a little while, we began running raffles, each with a ukulele as a prize. This was not only a fantastic way of building up funds to increase our stock of school ukuleles, it also made the whole school aware of the activity.
One other bit of advice, if you can, join a local ukulele group yourself, especially if you are a beginner. Apart from the obvious advantages of helping your own playing, it will give you ideas for your school club, help you make contacts with other local uke players and also add to the fun of your own ukulele experiences.