A professional pump called Somaerect Response can be bought online at imedicare.com for around £160. You need a pump like this if you want to attempt penetration as it comes with quality rings. I don’t think you should do anything till at least 10 weeks or on Uro advice.
If you go to Lovehoney.com and get a very simple pump for around £15 this will be perfectly ok just for ‘ exercising’ the old fella twice a day. Just create the vacuum and hold for 10 minutes each time. I have amazing recovery 5 yrs on but STILL use my pump 3 times a week !!
Good luck