Hi - You have a bit of work ahead of you and prepare yourself to spend a bit of money - Personally, I would think of painting as the last thing I would do. I purchased an Oday 22 for $500 2 years ago - it took me a full year to just get in the water and another year to get it ready enough to be on a mooring. My trailer, which I think of just barely ok, is light years ahead of yours - my boat came with a lot of "bits" and most of them were useless. As long as you have a mast, boom, rudder and tiller you are at a good starting point. You will NEED new standing rigging - not sure how much that will cost on your side of the pond - but on a small boat like that here expect about $400 - I would also replace all running rigging - the boat hasn't been sailed in a some time so you may not even have any - as long as you have the hardware the line won't be too expensive but new mainsheet and jib sheets may be ~ 75-100 plus new main and jib halyards for another 75 -100. I noticed you are missing the rubrail - so go ahead and budget another 150 for new rubrail. The chainplates should be checked - I would remove them - make sure the core isn't wet - then rebed them if they aren't too corroded. Also check where they are attached below - this is a safety item and shouldn't be ignored. I ended up replacing every bolt and screw on the topside of my boat and had to repair a fair amount of wet core. I spent 100+ on new stainless bolts and screws - then a ~ 60 on butyl tape for rebedding. It was a ton of work but totally worth it to have a water tight topside. One thing that will keep you going is doing a thorough cleaning of everything - it just feels better when the boat doesn't have all the mildew stains on it. Make sure that keel is well supported before climbing up there and doing work.
It is fully doable to restore the boat - and frankly - the type of boat really won't matter for the repair - look at the size rigging you may have or that other 17 footers have and base your purchases off of that - heck a rigging supplier will be able to help you with that as well - Once all the basics are done and you are able to sail her safely without any water ingress and she seems seaworthy - that is the time to paint her. Just my two cents
as an aside - I hope it has sails - if not you are in for the worst sticker shock - if you do - they may be in rough shape - that is ok for a season - but consider replacing or trying a place the rehabs old sail - it makes sailing more enjoyable when the sails perform as they are supposed to - best of luck!