What else do I need to complete ladder bar suspension

front of ladder bars....ladder bar cross member...with brackets...
Are the frame railed tied? If not you will need to tie the frame rails together to have a place to mount the front ladder bar crossmember

coil over shocks.....if that what you want....you will need upper and lower shock mounts....you will need a upper shock mount crossmember..
if you go cover of shocks you will need some kind of panhard bar....to hold the rear housing in place

you can use the leaf springs but will need some kind of slider for the lead springs...

it is not hard to do....just take your time....measure everything several times...tack weld...measure again...