As someone who has been doing this since the summer I can warn that if you want loads of certificates then its going to cost an awful lot! Genealogy is not cheap. I use the free stuff, I use the LDS site pecally for he parish records, I use my local (thankfully) archives as most of my lot stayed around here.
I also use Ancestry and Find My Past, they offer slightly different things at times and a good screen cap is almost as good as certificates..... so I reckon the yearly subs are cheaper.
But it is an expensive process.
Roger