Divorce Support Forums: going for sole custody after finalized divorce...

I need information regarding how to represent myself to go for sole custody of my children.
Last august my divorce was final with agreed shared parenting (me as the residential parent)of our two children ages 6 and 3.
Though, I do have the children now from monday morning through friday afterschool due to school. My x husband does not assist me in any means with the children other than taking them on the weekends. My problem with this is that he now lives with a girlfriend, and/or his mother... My children when there Do Not have their own beds to sleep in there. Also, my 3 year old who is potty trained started peeing his pants again, and i suspect that out of laziness he keeps him in a diaper while there. The nutrition of the kids I worry about, due to my children allowed to eat what they want anytime they want. (chocolate, chips, junk food). Again this is out of pure laziness. My X husband doesn't even have a stable job or income, probably contributing to most of my concern. My x husband is even on probation for a year due to "disorderly conduct" by entering my home uninvited and refusing to leave. I fear that he does have some psychological problems, as he does still kind of stalk me even after 2.5 years of separation. He has done a lot of things to me out of spite (false reports to children services, invading my personal relations, trying to get me in trouble at my place of employment, etc.), not taking into consideration what direct or indirect effect it has on our children.

I don't want to end visitation in any means with their father, due to their best interest and the fact that their father is the world to them. However, I am highly concerned with the living situation of my children in his care. I cannot afford much and was hoping to seek advice on what to do.

His best interest is for himself, not for them.

So, my question is do I have a leg to stand on with going for sole custody? And how do i do it representing myself?

Thanks anyone with advice.

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