Chances of getting a mortgage??

Basically looking to buy a 2nd house whilst im studying at uni. So I dont work but would have an income from the 1st house (not guaranteed I know)  approx rental income would be £565-595.

Would want to buy at around 85-90k mark and have 19k in cash for deposit and all fees.

My income is basically my student loan which id i am not sure how they class this?? 6k a year.

If no how much difference would a part time income of £80-100 a wk affect things and would you haveto have had the job for 6 months or something?

Thanks for any replies