there are special printer fabric sheets you can purchase- some are transfers (like decals on t-shirts) some are printed right on the fabric-like any printed fabric---you need to read the packages and find the one that fits your needs-some are washable-some are better suited for wall hangings. most will fade with time (and laundering)
you need an inkjet printer (not a laser printer)
you need to use good quality permenent ink (not the inexpensive knock off cartridges- or refill's)
you can prepare fabric for dyeing press it to freezer paper and do it yourself- but being your first time it may be best to purchase one of the ready mades- and after you have some experience you will feel more confident to experiment.
the pre-made products range in prices some come in packages of only 3 sheets--some packs of 10- visit a joannes-or a local quilt shop and see what they have in stock and read the packs---there is a new transfer one out that is supposed to make the picture softer-better and be permenent---found in some local quilt shops (the transfer ones you print your picture on the product---then iron it onto your fabric---
if you are doing a wallhanging-project that will not be laundered you have more options...for items that will be washed you need to really follow the instructions ---and use the stuff made to be washed...so read, read, read...and have fun with it-
and don't hesitate to ask your questions-the only dumb ones are the ones that don't get asked
