A few more tips for you, off the top of my head:

I get the best acid patterns when using a whole tone scale…so for c, that's c, d, e, f#, g#, a# (that sharps are what make it, though)

Be sure to use the cv & gate outputs into any old synths you've got, or a filter (such as the sherman filterbank) if it accepts those kinda inputs

Sample your 303 line and chop it in recycle…line it up in your sampler and fire it by midi. You can make loads more tight patterns by messing with the midi notes, but you do lose the use of the 303 filter…
But this also gives you the groove of the 303 in midi format - I've gotten some wicked hi-hat patterns and such by doing this.

Remember you can set the step / pattern length for anything up to 16…can't remember exactly how to do it but you can find out on the net. Odd lenghts (3, 9 etc) can work well.

Run your pattern through a triplet tempo-synced delay. Chorus works well too. But for nasty acid you need distortion - the sherman is a good choice, or run it into your desk pretty hard and crank up the mid eq.

Probably the best advice is to listen to lots of 303 tracks (hardfloor et al) and get some ideas…have fun too.