Lots of really dumb questions from a novice here - feel free to take the p*ss so long as you try and answer.

OK I've graduated from machines to dumbells - is this a good idea ? I'm trying to do fewer reps of heavier weights - generally 2 sets of 8 .

I've tried barbells but without a training partner aren't they a bit dangerous - I mean I tried a bench press and had a bit of trouble controlling the bar- it had less weight on it than I do with 2 dumbells so what was going on there? What are the simple barbell exercises that I might start with that can be done solo?

Also I went to the gym yesterday - is it worthwhile going again today - or should I rest - problem is I can't go until Monday if I don't go today.