How can I set footnote size to 10 and how to do basic line spacing?

I am writing my thesis and it requires me to use font size 12(Times New Roman) for main body and font size 8-10 for footnote. The required line space is 1.5. And also the footnote should use basic line spacing. I am not sure whether I already had these or not. Can anyone help with this? Here are my Latex codes

documentclass[12pt, a4paper, leqno]{article}
usepackage{a4wide}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}
usepackage{appendix}
usepackage{float, afterpage, rotating, graphicx}
usepackage{epstopdf}
usepackage{longtable, booktabs, tabularx}
usepackage{fancyvrb, moreverb, relsize}
usepackage{eurosym, calc}
usepackage{amsmath, amssymb, amsfonts, amsthm, bm}
usepackage{newtxtext,newtxmath}
usepackage{caption}
usepackage{mdwlist}
usepackage{xfrac}
usepackage{setspace}
usepackage{xcolor}
usepackage{subcaption}
usepackage{minibox}
usepackage{makecell}
renewcommand{theadfont}{normalsize}
usepackage{geometry}
geometry{
 left=3cm,
 right=2cm,
 top=2cm,
 bottom=2cm,
}
usepackage[unicode=true]{hyperref}
hypersetup{
    colorlinks=true,
    linkcolor=black,
    anchorcolor=black,
    citecolor=black,
    filecolor=black,
    menucolor=black,
    runcolor=black,
    urlcolor=black
}
widowpenalty=10000
clubpenalty=10000
setlength{parskip}{2ex}
setlength{parindent}{0ex}
setstretch{1.5}
usepackage[backend=bibtex]{biblatex}
addbibresource{refs.bib}

begin{document}


Say hi to latex......footnote{latex hello}


end{document}