The charities involved usually have free knitting patterns and advice on their websites so do not be worried by all the details as you really will be able to find a garment to suit both your knitting skills and the babies needs
Another very practical item to invest is a chart keeper, which is tool that can be used to keep and display patterns and charts, all whilst working on a particular project. The chart keeper can be opened out and stood up to place patterns in for easy reference when working on a project, and then folded up and stored away when not in use.
Other smaller accessories that can be particularly useful when working on a knitting project are stitch markers, which can be used to mark particular points in a pattern that you are working on. These often come in the form of small rings which can simply be slipped onto your knitting needles as you knit.
Size: Don’t put too much importance on trying to perfect the size of a preemie item of clothing. There is a great difference between premature baby sizes and so an item of any size should be suitable for at least one baby. As a general guide premature babies head circumference is roughly the same as their chest circumference. The average premature babies chest measurements are 8”-14”. However clothes of all sizes are needed for preemies, so no matter how big or small your item is it will most likely fit at least one baby.
Feed the Children: Feed The Children is a UK charity that has a knitting pattern for a jumper appropriate for children of all ages. They are also look for knitted hats, gloves and scarves.