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you could just add the RTF to calibre, convert it to epub in calibre, then (via the open with... calibre plug-in ) open the book for editing in sigil.
if the text is how you like it in rtf, then calibre will mostly preserve that in the epub conversion.
you can view ( = read only) the epub in either calibre viewer, or by installing & using (free) Adobe Digital Editions, in order to check that it looks right and that text reflows Ok when you change window size.
it may all seem daunting at first, but its actually nowhere near as hard as hacking CP/M, assembler etc.
lots of help and good advice available on sigil forum also.
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