I am not in position to give you some proper guidance but from what i've read so far, some tidbits to at least start with something,
do ashthang yog as much as you can, and to understand it read Gita Press' "PaatanjalYogPradeep" ( link to order it ->
Gitapress, alternatively there also is a scanned pdf version on archive.org at here ->
archive.org )
if it is too much just start doing Praanaayaam (and i mean actual pranayam, not just breathing exercises)...
the jyotish i have been following since past some years, Shri Vinay Jha ji, has told it many times
when you start doing pranayam and your cause is just and your faith is firm enough Ishwar himself starts showing path...
do note that in Ashthang Yog, Pranayam comes later after Yam-Niyam-Aasan...you may have to at least learn basics of those first three parts to be eligible for pranayam but please follow it throughly...
May Ishwar show you right path
Also you wanted to know about Jyotish as well,
Shri Vinay Jha ji's website on the topic would be helpful,
http://vedicastrology.wikidot.com/