Hello and welcome.. Everyone will have differing opinions but I would
Give everything a good deep clean.. Pop on a set of v brakes and maybe an 80mm fork(depending on geometry) to let you do some decent off roading and off you go
Current fleet- 95 Kona Cindercone- 87 Allegro - 78 Bob Jackson
Once owned-1999 Kona Explosif- 07 VooDoo Djab- 1991 Saracen traverse Hydratech 1993 Giant cadex CFM 2 1994 Kona AA. 1994 lava dome. 1995 Kona kula 80/81 Ron Cooper
"If at first you don't succeed remove all trace of having tried in the first place" D Brent !