GLM model

Please help if this is correct.

I want to test how big proportion of variance of continuous dependent variable I can explain with some number of independent variables that are of different kind.
Some of them are continuous, interval variables, and some of them are discontinuous (qualitative, nominal variables).
Is it correct to put them in GLM-General factorial procedure (in SPSS 8.0.) in this way:

continuous, quantitative variables into Covariates,
qualitative, nominal variables into Fixed factors.

What are the main parameters for estimation of their influence (B, eta-square...)

Thank you.