No problem, choose a beer kit you like the look of or one that has been recommended to you (The Coopers kits come recommended by many) then instead of adding the recommended amount of sugar/malt extract/beer kit enhancer use half the amount, make sure it is well dissolved and take a hydrometer reading, you want a reading of around 1.030, if it's too high add more water and stir well, if its too low add more sugar and again stir well before taking another hydrometer reading.
If it ferments down to a gravity of 1.006 then you will have an ABV of around 3.3% :thumb:
If you want a lower alcohol content reduce the the original gravity :thumb: