first is ...of course price... but 2nd hand or so can be an source to it, so...
what you want to "start out with"... your idea of shot you want to 'master'... (pick a book and see what Master you imagine you can copy...)
Be it model portrait shots ?(standard to tele lens)
Or great action sports? (fast body, AF..)
Or macro eyes of a fly? or ... (macro lens...)
Or the great view of interior (wide ./ultra wide lens)
or landscapes (wide lens)
of course there are something that interests you .. or narrow it and read about the lens..
All brand has some entry level.. body may be less important than lens...
There are many good photos out of 'cheap' body... (canon XT, XS... etc... )