Ok
Firstly parking will be a nightmare, we have just started the Brighton festival, so it is packed down here, best to set off extra early to beat the traffic (or branch off at the bottom of the M23, take the Worthing exit and come off at the first exit, Devil d**e/Hove, less traffic that way.
Cheapest parking will actually be the Churchill Sq shopping centre, central and close to everything.
Loads of great, cheap restaurants in the lanes (2 courses for £6.95 etc) Regency is a nice place and on the beach. Pubs like the druid in the lanes is nice and loads of outside seating in this great weather we have .
Must stress you set off as early as possible (to get here for say 9am) otherwise you will spend 3 hours in traffic.
My mob 07941 923903 call me if you get stuck
Regards
Martin