Several points on this:
If you have checked out the IATA Site as suggested by speedbird_heavy, you will have discovered how expensive IATA Publications are!
In general terms these publication are targeted at those who already have both experience and qualifications (i.e they are NOT learning tools), although they are all technically excellent some are written as cures for insomnia.
Similarly IATA Courses whilst again very good, are not really aimed at private individuals and are not cheap!.
So Redfred is correct if you are serious about this you really need to check out some of the Courses available in the UK.
These range through Full Time, Part time and Remote learning. But please accept that this is a complex subject and you have to work through the various levels of course!
A Level 1 Course seem to be around £300 - £500 for remote learning. A whole lot cheaper than IATA (especially when you add Travel and HOTAC)
I hope this is of some help.