Coding skills will be very helpful, look into learning python, bash and/or matlab. Experience with statistics and stats software such as R would also be helpful. There are a lot of good online tutorials and courses, for example on coursera. Speaking of which, they also have a good course on the basics of fMRI https://www.coursera.org/learn/functional-mri
There are also open neuroscience datasets - some of these have actual fmri images that can be analyzed, and others have extracted brain measures in spreadsheet form you can run statistics on. You may need someone with experience helping you learn how to work with that type of data though. However, there is a good tutorial of analysis with fsl on youtube https://www.youtube.com/playlist?list=PLB2iAtgpI4YHlH4sno3i3CUjCofI38a-3