Now i need to buy something to plug the hdd into.
I read some sort of sata drive network card? Or an ide to sata adapter.
A "network adapter" (if your console is a 3xxxx or 5xxxx model; 1xxxx ones have PCMCIA hard disks instead)
It is a very good idea to buy original Sony adapters for best compatibility (especially the American model with 56k modem, with no known imitations on the market), then if you want SATA open it up, remove the IDE connectors (each one it's on its own circuit board) and replace them with a SATA conversion kit, like the one available at abittop.com
I saw there are 64mb and 128mb memory cards are these reliable or do you stick with the 8mb sony ones? And can you save games to the hdd?
I always stick to originals, remember the official name for a PS2 memory card is "Memory Card (8MB) (for PlayStation 2)" and a small number of games took the name too literally, not to mention the guaranteed quality of the flash memory and MagicGate support
Some games have builtin HDD support, but won't work with 3rd party disks unless you "ATAD patch" the game, or more specifically their HDD driver (they also are 28-bit LBA, meaning it is a corruption hazard to use them on disks over 137 GB; not sure if there's a patch to upgrade them to 48-bit LBA)
Some versions of OPL, if you're going to use that to run your backups, support "VMC" - emulating a memory card with a file on HDD (per-game, shared, shared only among some games - at your discretion), but compatibility is definitely not 100% of the games that can be played from a backup on HDD
Can i rip my games from disc too an iso to put on the hdd or what do i do there?
There are 2 main programs to install games to HDD: HDL-Dum* (which supports disks connected directly to a PC, and via Ethernet), and HDLGameInstaller (which supports original discs inserted into the console, and via Ethernet); however installing original discs directly on the console is slow and fails easily in case of scratches or a bad optical drive, so I recommend always using a PC (directly with original disc or a disc image)
If i put the hdd into another fat ps2 does it work or do you have to install FHDB onto the ps2 first?
FHDB installs on the HDD, however the console's eeprom has an "HDD boot flag" (automatically enabled by the FHDB installer), which if left off causes the HDD to shut down and restart on every boot, which wastes time and unnecessarily wears the disk
For that reason, and because using disk images taken from other disks is a bad idea due to how APA (the PS2's partitioning system works), the first thing you should do once you get to a file manager (*LaunchELF) should be to go to the HDD Manager and reformat the disk, then run the newest FMCB/FHDB installer from an USB drive, and cleanly install FHDB