I-134 Evidence

[mc962 55]

I am preparing the I-134 for the K1 visa petition, and wanted to confirm instructions about what evidence I need. I know that there are several methods to qualify as a sponsor such as income, assets, etc.

I believe that based on income alone, I have at least several times what I need to qualify as a sponsor for the I-134, and can supply a letter from my employer and tax returns/transcripts for the past year where I've worked at the company (other years as well, but I didn't make as much before that). I also have other assets such as cash and life insurance and other property that could be entered into the form, although they wouldn't be what I would be primarily counting on to qualify.

Some of the information I've read seemed a bit confusing/conflicting. Some suggest to only put the assets you want to use to qualify such as employment information and tax returns, others seem to suggest to enter all your financial information (job, assets, insurance, real estate, etc.), and that the Officer will just prioritize income without looking much at the other stuff if that alone qualifies. 

I am curious what other people tend to put on the form ,particularly how detailed they get if they already qualify on income alone.
Also, does it make sense to list the previous 3 years of tax returns as some suggest, if I didn't make a significant amount of money in the first 2 years (in which case I would only submit the return for the year I made a useful amount of money in)?