Need job offer to obtain work visa

Hi,
still living in Austria, but would like to move to the US within the next 6 months (in case I get a job). Last week I started to apply for jobs in sales (sales assistant, sales manager, inside sales, admin.)nationwide.
I am 30 and have about 8 years work experience, the past 6 years in sales starting as admin. and now being sales assistant (basically doing everything a sales manager does, beside travel and have a much lower income).

Does anyone have an advise for me, like companies that are more willing to help people move to the US? Some online company applications already ask: will you need sponsorship to work in the US, wondering if this is pro or con??

Also applying for jobs in Canada, not sure if this is easier??

thanks already