Seriously I'd start at 0.25 just so you know what it's like! You may be able to titrate quickly but with the weekly injections, if you are miserable, you are stuck with it for a week.
It took me a while in the early stages to figure out that my nausea and indigestion were coming from my portion sizes and what I ate - I absolutely can't eat chocolate, fatty food or big portions (by which I mean bigger than 3 spoonfuls) anymore. It's a lot of adjusting of what you eat, what you serve, what you cook and shop for and even 4 months in a lot of Gaviscon gets taken.
Also with some doses, especially the smaller ones, you can eke more out of a pen as each pen is good for 6 weeks. I currently take 0.75 from a 1mg pen worked out from an online click chart - it means I get 5 weeks out of a pen which would only last me 4 at full dose and as I'm losing, I'm happy.