Could only text (keyword) is well enough to draw traffic towards site? Could I get backlinks through a simple keyword?
Yes, choose long tail keyword. so it will help to get more traffic to your site. And it is also useful to rank your keyword in Google.
text and links both are important . .you need to have proper anchor text, description to drive more traffic....
Both are important but to make best use of them, make sure they come from a quality source but it won't be bad to have them from any source.