Hi Charlotte and welcome to SAAFE

Without knowing where you are it's difficult to say, but Adultwork works better in some places than others and it's well worth considering some more advertising - there's a thread at the top of this board, plus lots of information about organising your own site if you chose to.
There's less demand for outcalls than incalls, and what there is in my experience tends to be in the evenings rather than during the day. I wouldn't say there are 'good' and 'bad' days especially as everybody's different - I rarely do outcalls because I'm far happier on my own territory but plenty of ladies only offer them and manage OK.
As for availability (as with the outcalls), the harder it is for people to book you then less of them will be able to, but if punters want to see you they'll normally find a way. I'd see how it goes and if you're concerned then maybe think about doing some regular incall days at a hotel?