Basic help required getting the bobbin thred to pick up

Recently bought this Riccar 3500. I removed various bits of thred from the bobbin area, guess this problem isn't new. Any ideas how I move forward?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0